I’ve run variations of these defenses for a couple of months now… all heroes at or just below +20 emblems (maxed mana Troops):
Finley, Grave, Telly, Onatel, Jabberwock
Onatel, c.Magni, Telly, Grave, Jabberwock
I’ve tried swapping in White Rabbit (+18) for Onatel, either left wing or right flank for many days of both raid and war defenses.
Onatel has performed clearly better for me (sorry no actual data), but it’s not even that close.
Here’s what I think is going on, some of which I’ve confirmed in war attack vids shared with me:
White rabbit hits very hard, and yet just doesn’t survive & punish a weak board the way that Onatel can.
Onatel in the wing works pretty well for all war rules (at least for the 3 older rules). Heals herself annoyingly much for field aid, and hits 3 very hard when wizard talent procs with attack buff.
Telly and Onatel actually have a bit of anti-mana synergy, especially when Onatel flanks…
Telly often lives long enough to slow their mana gain, and when she does Onatel is usually alive to take the baton & steal mana (undispellably). “Handcuffed” is the word I’ve seen others use to describe what Onatel can do to an opponent.
Both holy options with your fast support crew will do well, however.