I have a Benelli M2 in 20 gauge and I bought my son the SX3 in 20gauge.
The SX3 is a bit heavier but not by much. It recoils less than my M2. It is noticeable IMO.
Neither shotgun has hiccupped with any factory loading, but I have had the Benelli longer so take that FWIW.
I love Benellis but I have to say that thus far the SX3 is pretty fuggin' UBER and substantially cheaper.
I think Winchester hit a home run on the SX3 and I am no fan of Winchester.
Travis