Careful with cadet programs, they are recruiting tools and are designed to get noobs "on the hook" before they can interview at other airlines. It would be very short-term thinking to let a cadet program affect your choice of regional and possibly your long-term career progression. Whatever benefit you can get from a cadet program I can make at least that much money by picking up a 1-2 day weekend trip from OT at the major.
Prioritize your choices of regional based on location, upgrade, pay, training reputation, company reputation, etc. If your top choice(s) has a cadet program then feel free to take advantage of it, some of them do have some nice perks.