Yugioh - Both because more Yugioh is good no matter what kind of Yugioh it is
Escaflowne - Sub because the dub is horrendous, sadly
Fruits Basket - Dub because it is great
Gundam Wing - Dub because it is also great
Digimon - Dub because it is sufficient and all I really know
Sailor Moon - Both because (even though it's pretty bad,) the dub is nostalgic and my sister owns some of the sub on dvd