Baratheon. The one true king of Westeros will make sure the Lannisters, Boltons and Freys get theirs.
Besides...
Second picks would be the Starks (for their rugged Northern realm, sense of honour, history of supporting the Night's Watch, and the epic righteousness of the Hour of the Wolf during Aegon III's reign), or the Arryns for the best castle (the Eyrie, nestled high in the mountain, impenetrable and never taken by force).
Besides...
"We will march, and free Winterfell... or die in the attempt".
Second picks would be the Starks (for their rugged Northern realm, sense of honour, history of supporting the Night's Watch, and the epic righteousness of the Hour of the Wolf during Aegon III's reign), or the Arryns for the best castle (the Eyrie, nestled high in the mountain, impenetrable and never taken by force).