For crabgrass, Drive 75 is MUCH better. Works faster with no damage to surronding turf and turns crabgrass purple and dead instead of yellowish like MSMA.
For nutsedge you want Manage. Works MUCH better than MSMA because it gets the nutlet. MSMA leaves the nutlet to spout again.
As a season long grub control, Merit seems to be SOMEWHAT better than Mach 2.
Dylox is a curative. No risidual control. Apply when grubs are present. Merit must be applied before grubs are present.