Although they will both be up, it will end up being a personal preference thing. If you like CoD style games than you will end up liking SF more. If you like more classic FPS style than it will most probably be SF1
Both superb games imo.
Former Game Sage for Alliance of Valiant Arms and Soldier Front 2.
Watch my interview with Cairo/5thban here!: https://www.youtube.com/watch?v=_9JM_mI0o78