AliRidha :
No I have the gtx 660 ( its eligible for game stream) I only have the choice of the gs5 or iPhone 5s
It really down to you for phones. If you prefer a larger screen then choose the S5. If you already in the apple ecosystem, probably iphone 5s unless you really want to break away from it.
If you need storage with micro SD card, S5 is the winner here.
Alternatively you can sell either of the phone and buy the one you want.