So, few sidenotes that you should make.

1. Megalodon make the bloons vanish. And i believe that starts with T3. This is kinda like the Bloon Master Alchemist, you dont get any cash from it once they drag the bloons in the water. This is in a normal game a very big thing, making it very hard to use.
2. Pouaki is also very strong. It can solo wave 98, 99 and 100 on resort. Yes, a very easy level, but still. Place the main one in the square, 3 others just outside. And, dont forget, it brings the bloons back, making other towers able to hit them more often. So in chimps, probably actually the strongest.
3. Giganotosaurus is strong because it can stun all bloons, making other towers able to hit them more often. His weakpoint is camo, but can easily be solved of course. It can solo wave 98, and with a radar scanner it can deal with wave 99 and 100.

Conclusion: get ready to see them all nerfed. If one wont get nerfed, I actually think its Mega