Which alternate upgrade for Inferno do you like the most?

We could increase the speed of Archdevils! And if you're playing as Nibros, they'll definitely reach the archers! They usually don't make it to the archers, but you can drag the unit that's protecting the archers towards you (for example, with Elves, it's usually Treants or their upgraded form), and then attack with Imps, Hellhounds, or whatever summoned creature is closest! It's also good to use them against Humans and the Undead. For example, you can immediately drag Paladins or Lizard Riders towards you, and then they won't be able to scatter, and then you can attack them with Archdevils, Imps, and so on – basically, overwhelm them! IMHO.

In theory, it all sounds great, but in practice, it's quite problematic. First of all, for Archdevils to be effective, they need a speed of 8 without tactics and 7 with tactics. Tactics are easy to level up for Demons and happen quite often, but increasing speed is a problem. Although you might find boots that increase speed, which isn't a very rare artifact. It's unlikely that you'll be able to drag Paladins or Lizard Riders towards you, as the Archdevil has lower initiative. But there's a solution: you can level up the perk for increased attack speed and Keen Mind from Logistics. Then, maybe, Lesser Devils will attack first. Nibros looks pretty good in this regard; you can't block the tactics for Demons, so tactics become a guaranteed speed increase. But overall, he's not a great hero, IMHO.