Oh god i am going to get debated by pros but here is my opinion, I think Tyber Zann will win because we must not forget the arena is the whole galaxy not just Nar Shadda, imo he gets the edge here because he has a orginised army and so on, but i like G0-TO more as far as character goes >:

i think that if yo play as a "darkside" jedi you are more like a netural side or a grey jedi while lightside is a classic jedi thing while in sith how i see it is beinf a crazy sadistic psycopath or not

so i say go for it and here is my opinion I think a movie or a trilogy about the hundred years darkness would be nice