MTA plus is definitely No DriveBys, another plus is that you can shoot whoever you want. MTA's biggest negative side is that the team has "balanced" the weapons. The fact I can't kill anyone who's been knocked down is bad too.
VCMP on the other hand has original weapons which is great. DriveBys are not that good but being able to shoot a person who is knocked down is great. VCMP doesn't have any nadespammers nor armor glitchers. VCMP's sync is better, no doubt about that. VCMPs bad side is the fact I have to team with people same colour as me. (Yes that is annoying as I have be teamed with a black person if I pick the Prawn character). VCMP doesn't have many players nor servers, that isn't good. VCMP server admins don't kick cheaters.
But in my opinion VCMP is still better: being able to shoot a person with my M60, that still deals good damage, or with a stubby, that still has more than a single tactic (I can jump and switch), is better than fighting an armorglitched firespammer in MTA.