We had a choice between co-op and condo, the last time we moved, and went with condo for the reason you allude to - we didn't want the co-op getting in the way of us selling if we wanted to sell.
BTW, while there may or may not be laws about maintenance fee increases, as asserted by pp, generally the master deed or bylaws do cap increase. In our condo, there is a very clearly outlined cap. Beyond that, if the board tries to raise fees too much or too fast, they'll going to find themselves voted out; different condos and different co-ops might have restrictions on how easy that would be, but here, it's very simple. Maybe too simple.