Hey skoroa welcome to the forum! If you are looking for a durable
blade than you have come to the right place! You can dish out all sorts of pain to these blades without being able to hurt them at all so any of them will be plenty durable for you but if you want to be extra sure get one of the heavy grade blades that are made for heavy dueling! And the main difference between the regular grade and the ultraedge is how it looks when lit up but there are lots of pictures on here so take a look around:)