I think u should go with the Corsair 750W TX as :-
1. It will give u more power than 650W.
2. The cables are detachable so u can set them up according to ur need.
3.It looks great.
4. The difference between the 2 is not more than 10$
5. It is cooler than the 650W HX
6. With more power ur GPU will perform well which means great visuals .
What kind of performance? if you mean the watt output, of course the TX can output higher.
The difference is HX series is the detachable cable, so you can have more customizeable cable management. But if you have good casing with cable management path, i'd suggest the TX.