Been on a Wonder and an Explorer cruise. Enjoyed both, (who wouldn't?) ... DS was 2 on Wonder only used Flounders. He was 3 on Explorer and did use the Adventure Ocean, I found the staff to be wonderful and he enjoyed it.
FWIW ... we're doing Disney in '04 ... missed the "magic" ... can't explain it but everyone on these boards knows what I mean. EVERYONE is nicer on Disney, rooms are bigger, split bathroom is wonderful. More smoke and drunk people on RCL ... Enjoyed the dining rotation on Disney ... Felt more like a commodity on RCL, everything for the masses of guests ...
Having the hugh ship was nice, but how many bars to you need? Promenade was great, but one night we realized is like going to the mall on a Friday night!