Which Castle do you prefer to play as?

Personally, I choose factions not based on their strength or beauty..., and certainly not just because of one unit :). I try to play as the faction that resonates with me the most. Overall, Barbarian leaves the most pleasant impression. The early game is almost always without archers. It has a good combination of different types of troops and heroes.
Playing as Inferno is also definitely interesting.

The others are interesting in their own way, of course. Some are weaker, some are stronger..., but they just aren't for me...:)