the mexican turbos are MUCH bigger than the other snails. the also move much faster. because of size and speed, the mexican turbo could be considered a better cleaner. however, ime, most snails are very delicate, and mexican turbos being more than most. I've never been able to keep mexican turbos alive, and I've read that they prefer temps in the low to mid 70s. also in my experience, the nassarius snails are the hardiest snails. they are smaller yes, but they are fast and they are good cleaners.