Classic max RAM: 4MB
Classic II max RAM: 10MB
Argumentum ad verecundiam!
Just pointing out the reasons for choosing one over another is subjective and also depend on what you are planning to do with the machine. People will find desirability in one or all those models for all kinds of reasons. I would suggest spending some time reading articles (maybe LEM?) about the machines and choose from there. If you decide to part with some of them, please consider listing them in the trading post before disposing of them. :b&w:
Edit: Donating them is cool too!