Well I had a Lilith rainbow on my trooper list and after running through them, here's what I think

Warrior: Potential for stupid high damage, but not much else.

Magus: Very useful power move, maybe combine with Sentinel Lilith and GPD for maximum team protection.

Sentinel: Super low damage, but her healing passive and all ally resurrection power make up for it.

Assassin: Kind of a low RNG girl, not my favorite of the bunch, but with accuracy buff she becomes useful.

Gunner: Good basic and power move but her passive isn't long term useful.

So all in all they each have they're own useful quirks, but my favorites would be the Magus and Sentinel girls, because they would do well in a team together.