Only one I haven't played is MGE, so I'll leave it out.
Maybe bias, but MGQP is #1. It would easily be an awesome jrpg even without the h scenes. Same with MGQ, both have an amazing plot and really solid gameplay. (Don't get me wrong, the h is really good too
)
After that it's a tight race between MGD and SA.
Pros of Succubus Affection: really good game, fun mechanics and awesome pixelart. Has a similar case as MGQ as it would be a really good action platformer even without the h. Cons: it has a 50% chance of crashing my potato laptop (it doesn't like Unity XD)
Pros of MGD: Lots of content (even as it is not finished yet (really looking forward toward the capital ^_^)), the interactions with the monsters are really fun, the combat system is pretty fun and Jora is the cutest ever <3.