The quick answer. Clown cartridge gives you the chance for 1-3 bonus rockets pet heavy pick up. Tripod only shifts 2 rockets from your reserve to your tube. You still get 4 rockets with or without tripod. I've played with both and have had the chance to get up to 7 rockets...it's a great feeling... BUT, I ran into enough situations where the reload speed took too long and I died where if I had tripod, I would've at least fired another rocket. If you are a slower player...snipers/pulse/scout rifle, then clown cartridge is the best bet.