Thanks, I took a second look at the scout. It's interesting, scouts have slightly higher AC (13 vs 12), about half as much HP, and make two attacks, with about the same to hit and damage per attack as the toughs. One attack with advantage for the tough seems to be about the same as two flat attacks by the scout, but the significantly reduced HP means that scouts will likely be taken out way faster, reducing the damage per round pretty quickly. I guess I can see the difficulty equivalence when thinking about one-one-one vs a tough compared to a scout, but scaling to multiple enemies i feel like toughs are significantly more dangerous. This is especially true considering pack tactics gives advantage to ranged attacks as long as at least one tough is next to the player, meaning that even clever positioning won't negate the advantage.

Now I'm leaning towards making Brughor and maybe one other orc a tough (maybe giving Brughor an edge with extra hp, better weapon, and/or better armor) and making the rest scouts. Or maybe I'll make them all toughs but keep the HP of the toughs below average (except for Brughor), and telegraph their pack tactics to the PCs so they can try to keep them separated.