There isn't a huge difference in version exclusives. They both have a different grass type, psychic type, flying type, and 2 exclusive legendary. The grass and flying aren't any good in either version. The Psychic one is better in white version. White version also has the better final legendary.
I love the Resident Evil remake for the Gamecube. It set the bar for the survival horror genre that has never been matched since. Not even the Resident Evil series itself has beaten it. The music, the graphics, and the general atmosphere that it sets makes it my favorite game ever.
Dead Rising 2 took everything that Dead Rising was setting out to do, and improved on it. They fixed alot of frustrating bugs from the first one. Adding co-op was a stroke of genius. The story was more compelling, the characters were more developed, there are tons more weapons and clothes...
Its an all around better game in every way. Which is saying alot, cause I loved the first one. Both games are fantastic, but DR2 is definitely worth your time.