Quote Originally Posted by deadlegion View Post
Ext powered have always been more reliable overall. With USB powered the interface can die before the actual HDD does...yes I do know from personal experience and it can happen with quality HDD types (pretty much all my stuff is WD but I do have a Seagate).
Honestly if you're only going to use this at home (or somewhere else with mains power) then ext powered is best also because it's slightly cheaper.
ext sounds good then since I only want it for extra home storage. if I wanna travel with some extra space I'll grab a large sd card.