Well, considering Fencer c3 gets a skill to decrease enemies crit resist and another to increase your own crit damage on targets, I would probably feel safer with a lower probability, stronger crit than a higher probability, weaker crit.
Though I’m honestly not very well informed about how Fencers c3 will work.
EDIT: Looking at a bit of info about Fencer c3, might be better you pick 1:1 or 2:1 DEX / STR 



