I have a CVA optima V2 and a knight disc extreme, thumbhole stock.
Had a straight stock disc extreme in the past and a knight mk-85 in .54 and they all are good shooters.
If I had to pick one only I would do the disc extreme.
Knight is still having a clearance on the .52 cal models, $360 brand new
They don't make the .45 or .50 anymore
CVA optima I've never had a problem with either, it's a tack driver to, but the knight is more comfortable to me