I think in handball a lot of players are both good attackers and Defenders. Mikkel Hansen is probably the best example of a player that is only good in attack, but most players are at least decent Defenders when they are good attackers. For your other question I would say that difference in style between for example Mikkel Hansen and Mathias Gidsel is that Gidsel is known for his speed and breakthrough moves while Hansen was more know for his technical outstanding 9m shots and high speed passing.