I like having both out personally. Not because I like to heal vlad either, I make sure remi is immune to poi and par so I don't have to worry. But Hong's heals are actually significant. Her self heal is significant for her, and her cure/heal thingie is actually very effective if you use low-health squishy people alot like I do. Patchy, kaggy, tenshin (when Remi needs to recover sp, I swap her with tenshin sometimes), etc generally go from near-death to full from hong's puny heal =D.
Anyway, as much as I think Remi's completely uber stats make her good at pretty much anything, I prefer her as a dpser rather than a tank. She can really dish out some damage (lots of people seem to think she doesn't damage well, but nobody who does more damage than her is NEARLY as speedy as her, if you factor speed in, she does alot of damage). Plus, later on in the game, IMO you need 2 tanky characters out during alot of the boss fights. Alot have row-attack physical attacks that will probably slaughter people in the first AND second slots if they aren't beefy.