A poll is added. Please vote and share your experiences. 
If you select option: Other Brand then please post the brand name
Apologies for typos...
Here goes, I voted other brand as the main machine is now an ancient Quad Core Philips desk top machine.
It runs Vista for my wife as Windows is all she knows...
I have two laptops that I use at least daily...
1) 13 inch Macbook Pro, August 2012 vintage...
Pro's:- Quite a slick front end, GUI. Easy to use. Fast boot/reboot times. Neved had a SYSTEM crash.
Con's:- Safari is st. Some apps' can be unstable. I had to become an Apple developer
to obtain the GCC suite - WHAT! - it is free is it not? Some transient commands look ancient compared to Linux variants. And the worst of all is Finder, whoever designed that complete load of st wants shooting. I am using muCommander in its place. The text editor is worse than, dare I say it, Notepad... Enough of this ranting...
2) HP notebook, dual core about 6 years old now with Debian 6.0.x.
Pro's:- Is there anything more stable?
Con's:- Apart from rigidly sticking to F(L)OSS to the letter and having to obtain commercial
stuff manually then there are NO con's. Everything just works AND never crashes.
By far the best OS I have ever used except for my AMIGA of course which leads me
to my final OS......
AMIGA OS 3.1.x, my A1200(HD) is on 24/7 and has been for over 15 years and I still
develop for it. This is still the coolest most intuitive OS of all...
(/Me awaits the flak... ;o)
My primary computer brand is HP
Voted built my own, AMD APU based with additional GPU inside.
Using AMD cause i consider it good value for money.
My first PC built was cyrix based 
My primary computer is a Sager laptop.
FWIW - You do not need to become an apple developer to get GCC. It comes bundled with XCode (which is also free), regardles of your status as Apple dev.
Ontopic:
I do have an Apple too and have been using them for quite some time now. Currently using a 2012 rMBP.... best laptop I've ever used. 
dgcc has been available without xcode for many years through fink and macports (package managers for open source software).
Please don't misconstrue that as an Apple or OS X endorsement. To be clear, my experience with Apple laptop hardware was horrid. My white polycarbonate/fiberglass macbook ,within its first 2 years, suffered from a swollen battery, a/c adapter failure, cracks around the keyboard and display, a dead fan, a dead key, and several keys on the keyboard's home row whose letters wore off. Despite being a laptop, this machine never left my home and was always treated well. Note that none of these problems were unique to my machine; there are ample forum threads on the net about them. However, I do seem to have been particularly unfortunate in suffering from all of them.
To be fair, I must say that their customer service treated me well and attended to most of these issues. But, after the third year, when Applecare had expired and the machine began to refuse to charge, I took great joy in dropping it from a balcony, before running it over with my car, and slamming a sledgehammer upon it. My only lament is that I did not have thermite for the remains. In accordance with Apple's enviromentally-friendly policies, I properly disposed of the corpse.
I hear that the aluminum unibody designs are more robust. For those who invest them, I hope that's the case. I will steer clear.
A low-end Lenovo G570 that I bought 8 months ago just died last week. Consumer Electronics 101: it never bodes well when your computer releases its magic smoke. Very soon after the acrid smoke began to exit the vent, the machine shut down and has not shown any sign of life since. I suppose I should not have expected anything more when the manufacturer itself has little confidence in their product's quality: the machine shipped with a 6 month warranty (3 months for some parts, such as hinges).
I hope that the Thinkpad line hasn't suffered similarly. I owned a Thinkpad 486 that was still going strong 20 years after it was born. I only got rid of it because I had been accumulating too much disused hardware.
Since my Lenovo's passing, I will buy a new machine soon. Hopefully, after experiencing bad luck with my last two purchases, this next one will turn out well. Currently, I am dividing my time between a couple of laptops: a 7 yr old HP Compaq nx6325 (Windows XP/OpenBSD) and a 15 yr old Pentium II Compaq Armada 7800 (Debian). The open source unix systems run very well on both machines (I eschew elaborate desktop environments in favor of very lightweight tabbed window managers).
In an emergency, the Armada doubles as a heavy, devastingly lethal, blunt weapon (it weighs approx 9 lbs/4 kgs). [1980s Arnold Schwarzenegger]I will crush your puny ultrabook between my catastrophic, pumped up hinges![/1980s Arnold Schwarzenegger].
Since both of my current machines are related to Compaq, that's where I cast my vote.
Regards,
Alister
Other: msi
I got given a nice Gateway by my workplace as a Christmas bonus. I wouldn't ordinarily recommend Gateway, but this was a refurbished model they'd upgraded to the nines in an effort to make it sell... 8 gigs of ram, nice video card, etc. We stocked up on them and sold all but one, this one. Over a year now and going strong.
+1 for HP/HP Pavilion 
Currently using a Dell laptop with dual boot (Win7 and MintOS). I can't say I'm a Dell aficionado, but all my three laptop's happen to be Dell! Sheer co-incidence.
I do have a Raspberry PI, but don't use much of it; no separate display (I disconnected it from my TV and now lies in a dark spot connected to modem).. only for certain automated tasks.. and I connect to it from one of my Dell. So primarily a Dell computer.
Desktop is one I built myself and laptop is a work issues Dell machine.
I have old Dell laptop from 2000
I have a MacBook Pro now. Before that I had a Dell (XPS).
I like the MacBook but I was expecting something more for that price. After almost a year with the MacBook I still don't know if the price is worth it.
I don't know how much of the price is for the quality and how much is just for the brand
Mostly it's for the operating system.
I use two Apple MacBook Airs (MBA) for desktop work and Linux Ubuntu for servers; but I think this poll was mostly for "desktops", so I voted "Apple".
Happy New Year 2014.
All four of us (including wife and 2 kids) have Toshiba laptops. They were all fairly inexpensive; perhaps a sign of the times that computers have become like other items - disposable when broken.
My home PC is a HP xw6400; dual Xeon 5160's (3.0ghz), 8gb RAM, dual (non-SLI) Quadro FX 3500's.
I voted Apple it's the laptop I use most, but I do run Solaris on it so don't feel so bad.
Other stuff I have to play with;
V250 * 2
Netra 1405
M3000
T5120
AT7280
All Sun
I use Lenovo IBM thinkpad x60s for my personal use (OS : Ubuntu, Android, Win 7), and Centos for servers (Dell) at my work place.