Board Thread:Questions and Answers/@comment-67.85.255.241-20130703022847/@comment-24686081-20140522194446

For bloon popping power:

5. Ring Of Fire for tack shooter

4. Bloon impact for bomb tower

3. Arctic wind for ice tower

2. Ice shards for ice tower

1. Blade maelstorm for tack shooter

(Judged on how useful it is + efficienty or price/popping power)

MOAB popping power:

5.  Super monkey upgrades for super monkey

4.  Spectre for monkey ace

3.  Cripple MOAB for sniper monkey

2. MOAB mauler/assasain for bomb tower

1. Extra wide funnel(was that the name of the upgrade?) for the bloonchipper