All castles in Heroes 3.

I play different maps, randomly. I always choose Inferno, and always Pyre. Logistics doesn't hinder me, especially at the beginning. It might seem, what's the point of this artillery, but that's not the case. Upgraded artillery can deal very good damage, especially if the enemy is in a direct line of fire.
If Kalh appears in the tavern with 2 stacks of Gogs, you can clear out neutrals, and find some gold to build Efreet. In the first week, I always build Efreet + Stronghold. It only costs 9,000 gold, 10 wood, 20 ore, 3 mercury, sulfur, and gems to build Efreet, and the Gogs aren't even built yet. I return to my Castle, buy Efreet (5 of them), and go to deal with something more serious. Then, I try to build Devils by the 3rd week, but it usually happens by the 4th week, or even the 2nd month.
So, my choice is Inferno.