If you aren’t concened about arcade purity, then I too throw my weight behind the Saturn Vampire Saviour. It’s super arcade perfect (arcade perfect + missing characters from Vampire Hunter), and all text can be turned into english. Plus, you can’t beat the (JPN) Saturn controllers (unless you’re playing on sticks).
If you are concerned about arcade purity, then import PS2 DS collection is probably your best bet. I forget: Do any of the modified versions of DS in that collection have all the characters like Saturn Vampire Saviour or what?
As for which is the best version, even though I’m less familiar with it, I vote for Vampire Hunter over Vampire Saviour. Better round system, and all the characters are more interesting there than their watered down Vampire Saviour counterparts.