Macbook or Windows and if i were to get a windows, which one? (like Dell, lenovo, acer, etc)?

The best Windows to buy is Windows 7. Then install it on the Mac. That's what I did. It works great! If you get the 15-inch MacBook with the 2GB NVIDIA GeForce GT 750M, you can play any game at full frame rate.

You can also get an Alienware, but it will be double the thickness of the MBP and weigh more than twice as much (12 pounds!)

You can also get an Asus like this:
http://www.amazon.com/...00MMMMMX2/ It has old-school SATA hard drive (MBP has PCIe-based storage, 2.4 times faster than SATA SSD) and standard display (MBP has Retina for much higher pixel density) and old-school Wi-Fi (MBP has 802.11ac Wi-Fi) but for games, who cares?