Actually it was neither, Castlevania: Bloodlines happened instead. The only Castlevania game ever made for the Genesis... or Mega Drive abroad. The game itself also goes by a different name abroad, known as "Castlevania: The New Generation" in Europe and simply "Vampire Killer" in Japan. And it seemingly attempts to tie the Castlevania story in with the Bram Stoker Dracula novel itself. Well, sort of... the only real link is that the main whip-wielding hero is named John Morris and is presumably the son of the novel's Quincey Morris. That's about it, because the rest is standard Castlevania monster madness.
This game was made after Super Castlevania IV, yet apparently they thought those pesky control improvements were too good for this game, so they went back to the old style controls the NES games had. ... sort of. Jumping is still locked in straight-up or a single arc, but if you jump, you can whip diagonally-up or straight down. ... why bother removing whipping in eight directions then? Or taking out being able to control your jump? There were some spots in the game that I found annoying only because of the limited jump controls, but I guess that's standard Classicvania.
On the whole though it's actually overall an easy game for a Castlevania. ... except for a certain convention the entire rest of the series up until this point had that they also apparently decided was too good for this game: Infinite continues. Now, you only have three continues. Why?! That's literally the only thing keeping this game being "difficult." So I used an infinite continues cheat, because apparently I have to cheat to restore a series standard. What I didn't expect was that continuing didn't take you to the beginning of the stage like in previous games, but to the last checkpoint you reached in that stage; I guess the continue points were generous because they were limited, but still, limited is bullshit. In retrospect I could have made it more "authentic" by setting a save state at the beginning of a stage and reloading it after losing all lives, but eh, too late now; I'd probably consider it less easy if I had to redo the entire stage after a continue.
Overall though, stiff controls and limited continues aside, it was a solid game. Maybe someday I'll go back and give it that "authentic" treatment I mentioned, but I wanted to try the game out. I think that might honestly be my favorite Dracula fight as well.