Wow, Rundas vs. GLaDOS will be tough as well....
Dark Samus: 3
Gandrayda: 0
Boss themes are close, but Gandrayda gets the edge. Gandrayda also spawned the Sammy nickname, for what it's worth. But the real clincher is just the fact that when Dark Samus pulls out her version of Samus' weapons, they are superior (and cooler looking) than Gandrayda's.