These perks help you earn gems during runs.
You unlock Treasure Hunter once you complete World 5 (IIRC) while Wonder Hunter is only available in Endless, Endless Boss, and Dark Castle.
Treasure Hunter gives you 1 gem per 5 enemies killed while Wonder Hunter gives you 1 gem per 2 enemies. This means it’s not so useful to take these perks in the Weekend Boss run and the Endless Boss events.
Notes:
- Wonder Hunter does not require Treasure Hunter as a prerequisite.
- The perks stack - so if you have both you should be getting 7 gems per 10 enemies.