Depend of your lvl and the rest of your gear. If you have a lot of skill block naturally, you maybe don't need the one from gaudius. If you use lens and combi, you have probably already enought cooldown for seismic choc (cause you dont have to spam some buff like knights do). But then, have you enought stun in your boots, shield and weap. For the move speed, if you have wings + combi high speed in glove + quickness in boots + high lvl berserk buff, you maybe don't need the one from gaudius.
The +2 skill rank from both shutas don't provide that much benefit, if you consider only the crit passiv. You will not notice more chance of crit, and the dmg increase will be little. You will need to have other passive on which to count too, in order for the +2 rank to be valuable.
I think you may have to choose preferably between okheros and gaudius. The best would be to have both set and switch depending on the situation ^^.