Well here goes.......I too went and looked at the Sig (nope, never shot one) and held many diffeent varients (regular, SAS, DAK triggers, etc.)...spent lots of time in the stores just fondling them.....great feel and nicely made BUT (ok, again, here goes my try!)....for the size, it is much larger than you think, and not great in the capacity area for its size, and I personally dont like DA/SA transition or the heavy DAK.......have many Glocks but wanted a small 40 that was "comfortable" to shoot......so for me, I got the PPS in 40...and love it (yes had a few issues as my other posts have shown) but I love it....for me, the most easy kicking 40 cal bar none...and I owned a Glock 27 and hated it.......for the record, I own a Glock 19 and 26 in 9MM and lvoe them, but the 40 was uncomfortable in the 27 and I thought the Sig was just too big for what I was going to use it for. My PPS is not much larger than my Kahr PM9 and packs the same qty of ammo but in 40 and I can shoot it very comfortably.
Good luck with your search!