Choice of Romance was pretty good, in my opinion. Choice of zombies was fun. Choice of vampires ... actually sorta bored me by comparison, which was quite a surprise, I don't even remember why. Choice of the Dragon amused me quite a bit. Reckless Space Pirates was pretty good. Choice of Kung-fu was good. Choice of the Star Captain is pretty funny if you don't mind a really bitchy AI who insults you and threatens your existence at every turn. Choice of Broadsides was fun, too, if a bit short.
Choice of the Deathless, though ... that one I loved. It was the first one I really got into and it's just ... a really intriguing concept to me. You're sort of a combination lawyer, bounty-hunter, diplomat to the demon world, diplomat to the gods, and wizard rolled into one who can potentially (in theory, though not necessarily in game) preform necromancy on themselves, steal the souls of others, and become a god over laws of reality in alternate dimensions.
Not to mention, you begin the game in the middle of a fight for your life and your very existence actually shatters, so the entire game is you piecing together who you once were and how the fight ends.