I have been lucky enough to get both of them, and I only have the mats to max one at the moment. My current defense team is Lianna, Isarnia, Delilah, Sartana, and Marjana, all maxed. I also have Domitia 4/80, and Alasie, Drake, Greg and GM in the works, and a handful of other 5* that I haven’t started yet. I have the mats to max Vivica or Joon after I finish Drake, so I’m okay on healers, but you can’t have too many.
Which would you do first?