So far I've been investing in the defensive path. Oddly enough, the bonuses this gives (except for the extra abilities you get every 3 levels or so) are mostly a damage bonus to your defensive abilities. Which I guess is still okay, as it'll get you noticed in PvP a bit quicker and it'll build more threat in PvE, but some bonuses to defensive stats would be nice.
Edit: there is one defensive bonus actually, the toughness bonus for vengeful strike increases.