I think the [name]Ella[/name] combos don’t have the best flow, too many “[name]Al[/name]” sounds.
I decided for [name]Ava[/name] [name]Alexis[/name] because to me it’s the most interesting middle name choice and has a different ending ([name]Alexandra[/name] has the same). I think [name]Michelle[/name] has been overused for a long time and I like it the least from all your names. So that’s why it’s [name]Ava[/name] [name]Alexis[/name] for me.
[name]Ava[/name] [name]Alexander[/name] is the name of [name]Maya[/name] [name]Rudolph[/name]'s character on Up All [name]Night[/name] it’s very very catchy and strong.
All your choices are lovely. The only thing I’d say is that the [name]Ella[/name] combos sound slightly tongue-twistery… [name]Ella[/name] Ale–
I like [name]Ava[/name] [name]Alexis[/name] the most, myself!