If you have options, then you want to consider the requirements for the trainer. Is it 'just' sitting in a class room and learning book info? Does the person HAVE a dog? (Don't laugh, there is a trainer at my local PetCo who LOVES dogs, but has never HAD one!) Has the trainer had a dog in any sort of competition (obedience, rally, agility,field work . . . doesn't have to be SHOW / conformation). And the more obvious things like how long been training, what certifications, and so forth.

Maybe this will help you sort it out!