Of course Capablanca was better
http://www.chessmetrics.com/cm/CM2/PlayerProfile.asp?Params=199510SSSSS3S019593000000111000000000000010100
Capablanca took the match with Alekhine lightly and lost.
Alekhine did everything he could to avoid a re-match.
Capablanca put more effort into his learning but once he won the championship he became lazy.
Alekhine was just overall more creative.