6: turbo charge. By far the weakest, the boomerang mechanic barely works, and 600 ammo just doesn't cut it. funny because the patch notes say it used to only have 400
5: full auto rifle. unfortunate considering it's one of my favorite upgrades in the original, and the concept in zombies is a good one. The ads is terrible though, and it has the second worst pierce
4: bloonjitsu. fast, strong, practically requires headshots. other than that perfect mule kick weapon
3: recursive cluster. would be number 2 if it wasn't for the impoppable crashing issue. It pretty much acts exactly like the bt6 counterpart, so very big boom
2: juggernaut. Technically more poppi- I mean killing power than the recursive cluster, but it's far slower. more ammo though, really close between the two. no impoppable crashing tho.
1: sun avatar: not surprising, considering it's practically the wonder weapon. incredibly powerful, a bunch of ammo, no brainer really.