Which is better and why

[Hobgoblin]

I know i know rapiers are better then daggers in the long run.

My question is which is better before you get improved crit? and why

[Noctus]

Improved Crit doubles the crit range (and so the percentual chance).

Dagger = 10% chance for a potential crit.
Rapier = 15% chance for a potential crit.

If you double both chances, nothing changes in which crits more often.



P.S.
And Rapier has +1 base damage.