Hands down I've found Smith and Wesson revolvers to be far more accurate than any semi auto.
That's a fine statement, and I'm sure fully true and accurate,
for the guns you have tested. But there are a lot of guns out there you have not tested, I'm sure.
"any auto pistol" covers a really large range of guns. There's a LOT more gun designs out there than just the variations of the Browning tilt barrel service pistols.
And, as others have discussed, there is a difference between how accurate a given gun/load is, and how accurately the shooter can be with it.
2.5" group size was the magic number for many years. Revolvers that would shoot 2.5" or less, at 25yds were pronounced "accurate". Service class auto pistols that would do that were said to have match grade accuracy (and they were uncommon).
A low end target .22LR (like a Ruger Mk I with the "target barrel & sights) would usually shoot a smaller group than either a "match grade accurate service auto" or an "accurate" revolver.
I've got a Govt model .45ACP that, with the right ammo, will put 5 shots in 2.5" @25yds (when I do my part right
). But that 2.5" is also one ragged hole. I consider this accurate, for the type & caliber of gun it is. 5 overlapping shots from that Ruger .22 is a much smaller group size, but its the same degree of accuracy, or is it?
I have even gotten a 5 shot 1.25" 25yd group from one (fully stock, not tuned in any way) centerfire autopistol I own. And it's one I'm fairly confident you have never tested. .44 cal, and not a tilt barrel design.
"any autopistol" covers a LOT of ground....