SIII has the coating on the lenses, they both track the same as the internals are pretty much the same, the SIII is slightly more clear on foggy or rainy days or in lots of sunlight but on the average day to day use under a covered shooting line they are one of the same
The S2BS has an unforgiving eyebox when compared to a vx3. it isn't a big deal on a target rifle. But for hunting, there is better value for the $$ elsewhere imo.
I have never used a S3.
I have 2 x SIIBS in 3-9x42 and I don't have any issues like this with them.




























