Saibaman shares the endings with Vegeta, some of them are pretty much impossible unless you speedrun all the Power Keys before Nappa appears.
It's not worth it and we know for a fact that it skips to Vegeta.

00:00 Saibaman & Vegeta Win (Survivors Defeated)
00:25 Nappa Win (Survivors Defeated)
00:47 Great Ape Vegeta Win (Survivors Defeated)
01:08 Nappa Win (ETM)
01:37 Vegeta Win (ETM)
02:05 Great Ape Vegeta Win (ETM)
02:32 Nappa Defeat (STM)
02:59 Vegeta Defeat (STM)
03:27 Vegeta Defeat (HP)
03:50 Great Ape Vegeta Defeat (STM)
04:18 Great Ape Vegeta Defeat (HP)