[Trinity and Valkyr.... Do many people use them?]

Valkyr is above and beyond my favorite and most used frame. Tanking 1hr into Survival Arbitration without using Hysteria just feels good. With a high range melee she can usual hold her own in most other modes as well.

 

Trinity on the other hand can tank 20 lvl 550 Juggernaut Behemoths with Adaptation and all her buffs active, but her cast speed and short buff times make her clunky and boring. Most players usually complain when you're not EVing the whole mission as well. She definitely could use some QOL updates.