I really enjoyed SC4 when I played it in '94 (I was late to the party with not owning a SNES until then). The music is something to enjoy on the SNES along with just the overall atmosphere. So I have a bit more nostalgic moments with it along with Bloodlines.
I never got to play Dracula X for PCE until I got a Duo in 2000. It is definitely an overall better game than SC4 and it would be even more so if I played it around the time it came out.... especially due to the fact I played Symphony of The Night 4 years before it (JP and US versions). The soundtrack has the best of all the classic Castlevania games in redbook audio and very nice vibrant colors. More importantly, it has the best replay value of all the classic games and just the right challenge.