Basically, angled grip is only good if your gun of choice has high first shot multiplier. OR if you are using a DMR, all of which kick like a mule, and you need to stay on target.
Muzzle break lowers vertical recoil while adding to spread, which lowers accuracy from pure mathematic point of view. On SOME guns it might be beneficial though, if they have so horrible vertical recoil you can't stay on target. Hitting something>hitting nothing, obviously. There's only a handful of such guns though.
Compensator is much better choice though. It adds to spread as well, but lowers horizontal recoil, which cannot be compensated for in any way (unless you use cheats, but that's out of question I guess).
P.S. The spread is actually spread increase, so if you are bursting rather than magdumping, compensator is hands down winner in everything.