Time for my 2 cents. PC vs Mac, both are powerful, both are fast. I have 7 PCs and two Macs. I built 2 of the PCs and the others are laptops (Sony, HP, Toshiba) and one tower (HP). 1 PC still works (one of the ones I built myself), both Macs still work. With the PCs, you name it, motherboard failure, HD failure, virus. All of my laptops have had battery issues except one of the macs.
Now, PC always claims to be cheaper and for average systems they are. Best Buy will be glad to remove all the trial software on your PC for you and you get OS and thats about it. All software on the Mac are full license.
If you want to go full on power you can compare a PC Workstation with the Mac Pro. I compared an HP recently mentioned in one of the Photo magazines that ran Quad-core, 12GB ram, 1 SSD and 1 512GB drive. It was just over $5K. Compared a similar Mac Pro and it was a few dollars difference.
If you want to go all out in speed I have yet to see a PC that offers 12-core Xeon system with up to 32GB, and four bays for SSD or up to 2TB drives that could be installed by my 13 year old daughter. If you want to know what I mean, by that check out their website on the Mac Pro to see how easy it is to upgrade at any time.