Benefits of buying 1070 rather 980 ti.

The 1070 is faster by about 5fps than the 980 ti.
http://www.pcgamer.com/geforce-gtx-1070-performance-preview/

It will play anything like a dream, although 144fps may be. a stretch for some games. Stuff like CSGO, BF4 should play pretty smoothly at a very high fps. Although don't expect to play stuff like BF1 at that fps.

Both of those cards should do you very well though :)
 


Thanks! I`m using the 144hz only for csgo and other shooting games.
 


Only for cs go then any gpu will do. I am using a GTx 760 and it always goes above 100fps