Apulia: Big, friendly family. Easy to expand southwest into Muslim territory; no claims needed.
Bavaria: On the crossroads between Germany, Italy, Hungary, and Croatia. There's got to be at least one direction in which to expand. Good relations with the Kaiser.
HRE - Busy place; nobles and peasants constantly rebelling; lots of murder plots to uncover.
Brittany; Savoie: No viable way to expand. Boring game.
Turow: One of the remnants of the Rus Kingdom. Although it's possible to start putting the kingdom back together, to do that, you must forever battle your brothers for their shares.