If you're looking for slots specifically, I would go with the Irish canyons even though they're dry canyons. I am a little confused by your pairing them with Cedar Mesa though, as the two are in opposite directions of travel from Moab.
A lot of the canyon routes right around Moab are more adventure hiking, i.e. not a lot of slot sections, but navigating canyon drainages with rappels. They also often have several names due to different guide services/guidebooks/internet sites which is confusing. I could be wrong, but I'm guessing Pritchett is the same as Hypatia, which is also known as Pool Arch or Rock of Ages. Super fun, but only about 30 meters of slot travel.
Alcatraz you rap off your car. I mean, that's pretty cool.
Entrajo - seems good, is good. Short, but a great beginner canyon and a short drive from downtown. The pools might be a little chilly in April, but they're short and you'll dry off fast.
Zero G - many people's favorite, and a nice introduction to the Swell.