I've did RA and Komodo within a year and while experience can easily vary due to weather, etc, I felt the short answer is both are very comparable with RA edging out a little. I say it edged out only because we had a few more dives with amazing amount of fishlife in RA, and even more "isolated" feeling. THat said, if you have been to RA, I'd either do another part of RA or go to Komodo. I've seen a few good trip reports on Alor and it has some great diving too.
Don't get me wrong, because we did have some amazing dives, complemented by weather, in Komodo. Best night dive with all the critters in the book, Cannibal Rock dive #1 was literally top dive, current dive through Shotgun was amazing with a wall of fish 60 feet high; but then the silversides, etc in RA were absolutely amazing. Had to be millions of them and swirling in all directions, with mobular rays coming through.