Can't vote here I am afraid. Both games are totally amazing.
DKC gave me amazing visuals and sound it 1994 coupled with brilliant levels and a lot of variety with the locations. The opening level alone sold me on the game and the underwater levels were just beautiful. The music is flawless to this day it still amazes me.
DKC Returns gives you amazing visuals in a different way, not in the forefront of technology but at the forefront of charm and design. Levels are excellent, loads going on with the right level of challenge. The music is also superbly done, giving proper remakes of the old tunes and a few new ones too. The lack of underwater levels and pointless shaking are the only problems for me.