Orcs. Upgrade or alternative upgrade?

I played with Trappers, and it changed my perspective... They are stronger (because it's hard to defeat an Orc with Fury), and Goblins are only really useful at the beginning when you don't have a large army of Warriors. Also, Goblin abilities aren't very good. Now I choose based on the situation. Regarding the Nomadic Centaurs: +1 damage won't help when there are 10 Nomadic Centaurs. But when there are 150-200 Centaurs, that +1 can be worth one extra Titan...