if u can outclear enemy without thumper go cooldown mod, if you cant (or wants to solo objectives), take thumper. 2nd mod turret burn, 3rd mod double turret anything other than conquest go 1st mod cooldown, you dont need thumper since u r clearing with ur team
if u dont have thumper buy one multipod for mana and doubleheal
if you need antiheal
if you dont get focused late / can survive
if you dont want active items / enemy builds a lot HP