For me, I feel Ellen is harder to play because you are vulnerable when in dash charged attack and the whole chain takes like 3 seconds? So you'll be sitting ducks for 3 seconds trying to get those flash freeze stacks. For Zhu Yuan, she is so fluid. Shooting, dodging left and right. Jumping here and there. She seems easier to play. Her only issue is bullets but she got lots of avenues for bullets. Her ult, her skill, etc. Overall, I tried Ellen like 7 times alrd and still hate her playstyle. Dashing, charge attack. Like I have to find a moment and cancel my action when I see a flashing red or gold light. Zhu Yuan just pew pew, dodge left, dodge right. Parry, Lycaon in. Daze, ZY in. Lycaon in. Soukaku in, ZY back in. Then pew pew, win games. Seems like less research required. Of course Ellen can dish out more dps but you'll probably have to study enemy attacks and mald while using her.