Jeez, nobody's posted here in a while. Anyway, I'd choose Super's, mainly because of the emotional impact. I think that Samus probably had maternal feelings towards the infant Metroid, and the moment of revenge on the Brain is just perfect.
On a side note, the hyper beam is far cooler (rainbow colors... ooh) than any of the other deus ex machina end of the game weapons, even the phazon beam.
On a side note, the hyper beam is far cooler (rainbow colors... ooh) than any of the other deus ex machina end of the game weapons, even the phazon beam.