There is no such thing as "raidbuddy" as far as I know? Or do you mean "raidbot"? It is a botbase made for use with combat routines that handle the rotation automatically while you move your character by hand.
Not better, not worse. Just less added stuff then lazyraider, and comes with the HB package. If you don't use features lazyraider offers which raid bot doesn't stick with raidbot.
RaidBot was specifically written to have as little overhead as possible. It's supposed to improve the performance of your CC in the raids since there's no other code to execute but the CC. CCs can be specifically written for RaidBot to improve this even further.