The difference (If difference there is) is mainly legendary/raids toon based
Yoda General Kenobi CLS Jedi Training Rey BB8 Raid Han vs Thrawn and Palpatine.
In non legendary characters the difference is purely duo based.
That is to say Wiggs and Chaze pair synergy.
A couple of dark side characters that had that type of synergy would make the sides equal in non legendary characters.
The thing is everyone uses rebels because rebels can fit with when you have cls r2d2 raid Han. They aren't using them because they overpoweringnin and of themselves. I can't even count the number of times I've seen it posted on this forum where who can fit in with those 3.
If you give Vader a decent legendary ability and savage/maul some decent pair synergy Sith will come close to being better than rebels (as a non legendary faction).
One of the developers recently mentioned in an interview they want to move towards a system where there is some rock paper scissors at play and no one meta at play.
Night sisters being frustrating to some teams yet murdered in 30 seconds by non zetaed troopers is a great example. The emergence of Jedi training Rey as an alternate leader in the meta is another.
Having a stronger empire and Sith teams would be perfect in achieving this so I hope the developers listen to you. Also one more very good resistance character to drive cls from the resistance team would be a good thing.
