Hel or Santana- do I replace Proteus?

[Vladarian]

I’ve got Poseidon, Proteus and Aerial in my main line-up (which gives me a defence bonus).
I only need 1 more telescope to ascend Aerial but I also have Alasie ready to ascend.

I’ve got just enough Tabards to Ascend either Hel or Sartana. Not sure what to do…

Should I max Hel and swap out Proteus?
Also have enough potions to fully ascend a green hero but only have Elkanen ready. Ive recently pulled Lianna should I start building her up or wait for a different hero (as Alasie will be my Archer)

[Radar1]

Lianna is very good even without emblems, and definetly better than Elk.

Hel is better than Proteus, she have higher stats, can survive longer and deal high dmg.
Hel>Sartana

[AirHawk]

Hel.

Other snipers can replace Sartana.