If you are talking about a composter then red wigglers would be great. They help speed the breakdown of kitchen scraps and garden waste into great compost. Earthworms on the other hand do not like to be out of the soil and will try their best to leave a composter, or worm bin, etc. to get back to the soil. My mom loved my worm composter and made her own but instead of buying red wigglers like me, she tried to go out after rains and bring in earthworms she found... then she wondered why her worms kept trying to escape and ending up all over her patio floor?!
