collective ships since the update are very interesting to work wtih for sure, and they actually are a race with some kick now, add to that you make a bunch by building up a planet population wise then plundering it for cash.
aminer though also are kick botty cheek`s now too, ships adjusted as well, make cash in a hurry, though if you were going pure war and attack i`d go collective, but stick to prs under 8 mill.
with aminer pr choice is yours, just learn how to stack with them, they`re a breeze to make money off with mining, market is always short of minerals, and they are a fav race of mine along with marauder and terran.