@vara shriekers have 8 quanta cost while golems have 4 quanta cost.
6<8 damage but you can summon 2 golems for the cost of 8 quanta
so 12>8 damage
That's right, but you have about 14 pillars, so you could easily put down the shriekers, by 3rd turn i guarantee that you would have 8 pillars down(even better if they are upgraded). so, that's 10 damage extra in a turn.
I tried both, I found shriekers have more % of winning against T50's.