Yes I believe it is. I own both. I had the GC one then my friend got the xbox one and I'm like holey shit what am I doing?! So I got the xbox version. Not only is spawn cooler, but it looks much better and the controls are just totally better.
I was going to build a set top pc, but bought an xbox instead (for some reason), in any case, after buying it, and a 120GB hdd, and a mod chip, it basically does everything I'd want a set top to do. I can watch dvd's on it, I can play emu games on it, I can play xbox games on it (duh). The only thing I'm not liking is that some of the emu's don't run quite as smoothly as they would on a pc. Overall I'm very impressed with the unofficial xbox stuff. For actual games, I'd suggest PSO (I know I know, but it's still fun to me lmao), Kotor, Soul Calibur 2 is spiffy too. I wouldn't bother with SC2 if you already have it on the cube though. And I also wouldn't bother with DOA Volleyball. If you want fan service go get some pr0n. If you want to play a game... DOA Volleyball is about as shallow as the kiddy pool.