For XVG I was on zpool for 12 hours with zero rejected shares, but they take too much and my wallet for whatever reason is set to mine all blake2s instead of just verge then autoexchange.  Unimining = 10%+ rejected shares.  Antminepool I've only had one rejected share so far, but hasn't been running long.  Going to run for 12 hours and see the difference in currency between the two.