Both supers last around 10 seconds. If you mess up and die in the activation, where you are vulnerable, you don't even get it for re-spawn, which titans and warlocks do. I have seen wasted/wasted many a Bladedance thanks to a very small duration which gets 0.5-1.0 second cut off after every attack.

Supers are called supers for a reason , all supers are almost a garunteed kill/points in your favor. You shouldn't have but so much of a chance against ANY class using a super, and when speaking in terms of comparison, you should (in my opinion) only compare super v super not super v player because if you could just dust off someone with your primary when they use it then how is it a super? Nothing is "op" as far as supers go because that goes against the term itself, a super wouldn't be so super. I don't really feel like mapping it all out but I'll leave by saying this, a bladedancer will always lose to a titan in the battle of the supers, if a bladedance beats a titan it's because you weren't quick enough

Let's not forget if a hunter is in special like blade dancer and comes across a titan or warlock, (in special) the titan / warlock always win