I also hate those passionate wars between Mac and Pc users and I would not like it. To begin with I say I use both Macs and Pcs, I own both and I am no fanatic of either. All I care is to do my work properly and cost effectively. So I like Macs, they look nice, they work real nice, they are stable, generally speaking. But... IMO, maybe... (don't get me wrong), they cost a lot. So to speak with facts, I recently bought a Mac Pro basic with 3gb ram, which cost me 2800Euros. I also wanted a second engine for the studio, but I did not have the budget for an other Mac, so I contacted a friend who builds Pcs for designers and he put together a nice beast. It runs a Quad Core, 3gbs of Ram and Two Raptors 150Gb each at 10000rpm! It is mad fast, I only run CS3 photoshop on it, it does not look very nice and I honestly cannot detect speed differences with my mac. Best thing though, was the cost: 1300Euros...
If it gets built by a good mechanic, I believe a PC can be very stable. For PC users one can say they can find software on the net more easily, if you know what I mean... (please say I never said that ).
In other words if you don't mind using a PC for any reason, you can get away with a smaller expence and for sure you ll do things fast and reliably. On the other hand if you feel you have the money for the Mac, then go for it, you will not regret.
If you know how both platforms work, you will have no trouble doing your workflow smoothly. If you have never used a Mac before, then for sure you will find it a bit strange at the beggining, ut soon you'll get used to it.
Oh I forgot to mention I ve used both engines on 39mpxls files.
It is a huge conversation to get into, but for me it is very simple. Ask your pocket first.