Which CE is better for Jalter??

I would say the joint recital due to buster np and the difference between buster effect and crit effect percentage isnt a lot of different

Joint Recital and Victor of the Moon are best for her. Anything that boosts attack. Sumo would be good for her too.

Generally, I would say anything that increases Buster performance is viable, Limited/Zero Over and Verdant Sound of Destruction for example.
Also, Maiden Leading Chaldea is great as it increases Buster performance and also generates some crit stars which compliments Jalters skillset nicely. Maybe even Halloween Princess for the NP boost could be a go to. Just some ideas hope they help.

for non-MLB joint recital is better, when Victor is MLB then that becomes best