Reasons not to get an AMD/ATI GPU and CPU?

New here, not sure if this is the right section, do forgive me please. :stuck_out_tongue:

Hi guys, need your help and insight for a bit.

Basically, I’m building a PC mainly for render high polygonal scenes and game development. Specs are undecided but I prefer nVidia GPU’s and will most definitely get an Intel processor, first timer here so asking a bit of help from experienced PC Builders. :3

State why I should not choose AMD/ATI GPU’s and CPU’s for rendering stuff in Blender and game development in Unity3D.
Cheers. http://armedunity.com/public/style_emoticons/default/4.gif

State why I should not choose AMD/ATI GPU’s and CPU’s for rendering stuff in Blender
GPU accelerated cycles rendering with CUDA only available of compatible NVidia graphics cards http://wiki.blender.org/index.php/Doc:2.6/Manual/Render/Cycles/GPU_Rendering