Uber elder or maven next?

Already got 2 voidstones, what would be the easiest next boss uber elder or maven?

Probably on par difficulty wise imo. Tho I'd personally say Maven is "easier", there's less random stuff that can happen, so long as you're ok with the memory game. Getting elder slowed, shaper beamed and an orb appearing all at once can be a pain.

If you are good with Maven mechanics, she's much easier. Uber Elder hits a lot harder.