Zaxara, the Exemplary has had my eye for a minute and could be fun to brew for.

I love eldrazi so much. They are what got me into magic. Picking a favorite is no easy task. So, I'll just go with my favorite of the 3 titans and say Ulamog. Specifically Ulamog, the Defiler, because look at that art. How could I not choose him and his powerful T-pose.