Best GPU for system

[blade624]

I am thinking of upgrading my current graphics card from a r9 270x 2gb, to either a r9 480 8gb or a gtx 1060 6gb. Which one is best for gaming and streaming videos at the same time?

Motherboard-Gigabyte ud3 990fx
Graphics card- R9 270x 2gb
processor- amd fx 8350 8 core
Power supply- Corsair RM series 750w
12gb 1600mhz gskill ram

 

[cin19]

If you don't use the 4K monitor, you can use either 4gb rx480 or 3gb gtx1060 too. When you upgrade to either one, that will be a big jump.
Also it depends on what games you play, read the review you will know what I mean.
gtx1060 3gb vs rx480 4gb http://www.techspot.com/review/1237-msi-geforce-gtx-1060-3gb/
RX480 4gb vs 8gb http://www.legitreviews.com/amd-radeon-rx-480-4gb-versus-radeon-rx-480-8gb_183576