Also, the Targs anyway. Blackfyres can go to hell. "My daddy gave me a sword so now I get to be a king cuz I'm good at cutting shit in half and stuff."
I would say Blackfyre. Yes, Daddy gave Daemon a sword, but it wasnt just any sword. It was Aegon I's sword, the sword of kings, carried by Targaryen kings. Thats a helluva sword to be given, its practically naming the guy your heir. Now granted "daddy" was more of a drunken buffoon than Robert but still. Plus, Daemon only sought the crown after being slighted (something about a woman he loved and who loved him being sworn to another by the king). He seemed like an honorable guy and I'd have no problem rolling with him. especially since the legit king was thought to be a bastard as well (& not one of the Kings at that).