Get a fixed blade, a folder is really just a broken fixed blade.
I don't see how this applies to the OPs question, since a fixed blade with the "wrong" steel is going to have the same problems.
The OP clearly stated that he wants a knife that "....folds and can keep a decent edge"
Do you have any suggestions that apply?
I'd avoid the "super steels." The 10XX suggestion made about would be great choices, as would something like AUS-8.
They are not hard, so they dont behave "like glass", and since they are not hard, they sharpen easily. They are tough, and they are inexpensive.
Something like a Kabar Dozier, used correctly, would be my choice for a good knife that "....folds and can keep a decent edge"

