Just finished echoes of the past- crimson fleet or sysdef?

Hey guys. Still on my first play through.

Just completed echoes of the past and done the debriefing with ikande/etc.

My question is at what point do you have to decide between crimson fleet or sysdef for faction allegiance? I don’t know which I want to side with yet but want to continue the quest line as it seems the most entertaining so far.

Any help would be appreciated.

Thank you 🙏