Hermit crabs Red legged vs.blue

[harryb18]

I'm in the process of ordering a clean up crew. My question is which hermit crab is more desirable and can do a better job the red legged hermit or the blue legged hermit. Also I have a variety of snails trocus, & nasirius will both of the crabs kill the snails?

 

[Deanos]

Scarlet Vs Blue-legged