Depends on your strengths and weaknesses, game type, map and opponent style. This gamer finds
Easiest are FMG9, striker with usual prof, QS sniper and does use BTW
Mid SMGs and maybe FAD
Hard ARS best ACR, SR used for sniping not a sniper so can't advise.
This gamer plays DOM cap n defend 2 so mobility from mid point and CQ is order for the day PP90 with Ext mag works on tight or clustered maps. FAD for mid long rnge fights you get on bigger maps with less clutter and choke points.
Best weapons depend on the map and what style of play you adopt on that map also. Any reasonably large map with decent sight lines (like bakarra) I would usually go with MK14 if i choose to be quite mobile and in the open, although, I have also used a sub on this map when I chose to stay in and around buildings trying to lockdown a particular area.
On a map like Sea Town I would normally go with a sub.... MP7 / PPM90 or UMP (MP7 would probably be my first choice though).
MP7 With RFand silencer with
sleight of hand pro
steady aim pro
works for me on the smaller maps but just as effective on the bigger maps we do have,i
prefer the scar for accrucey over the ACR although the fire rate is a tad slower i still think it outshoots the ACR, but thats just down to personal preferance , i have found the G36C to be a very good weapon with a silencer attached also,