dude....what did i just say?
because the highest damage daggers are the slower ones
simple as that.
if you can find something faster with a high damage output....that go with that. typically, the highest DMG output are the ones with 1.8 spd. as opposed to anything faster.
also, it all falls back to your playing style. find something you like and stick with it.
more reading regarding dagger speed for mut: