Crayfish with mosqito fish?

[Ichthyotopia]

I really want to get some crayfish for my 20 gallon mosquito fish tank but i cant decide whether to get some marbled crayfish or some dwarf crayfish.
which would would be the least threat to the mosquito fish?

 

[Ichthyotopia]

marbled crayfish, orange dwarf crayfish, or dwarf cajun crayfish