I have both brands. The Sar seems to be a little below the Canik in my opinion but that is just my opinion.
My Sar and Canik pistols have been very good so far.
I think the Witness P series is a very good brand/model also.
I have not really had any problems yet with them except for the Sar, the trigger pin initially tried to walk out the right side of the pistol and the slide lock/take down pin shaft has loosened up just a little.
The trigger pin problem was taken care of by the use of green Loctite, may have to get a new slide lock/take down pin.
As for accuracy and function they perform on level with my CZs.
Sar B6P, Witness P S, Canik C-100 and a SF Elite, all in 9mm.