Depends on a lot of factors. I'll always take phoenix claw (used to take kerosene in place of claw, but 1.3 makes that impossible now), and usually kerosene, but moonshine is better on a pyramidion imo. Great for ramming as well as defending against rams so you don't get completely turned around. As for the third slot, usually either chute vent or hydrogen, but if I see that I'm going up against carronades or lumberjacks, I'll take drogue chute. Not a big fan of tar, but sometimes I'll take it on a squid since I'm doing a lot of evading.