Actually, there are far more differences than similarities, and the exact differences actually depends upon the specific model of DW in question. Unfortunately, I don't have time now to list everything in detail, but I suggest you take a look at both mfg's websites, and also do a "search" on this forum for more information. Guanantee that someone will chime in with more detail in a bit.
While they look the same...they aren't. The DW uses the Colt pre-Series 70 FP ignition system (no firing pin safety) while the S&W uses their own unique firing pin safety system which is a blend of the Swartz (Kimber) and the Series 80 (Colt) FP safety system.
The S&W has a bead blasted finish. The DW has a hand worked stainless finish.
The DW comes with a proof target to show accuracy...the S&W doesn't.
The DW has a MSRP of $899 while the S&W has a MSRP of $932.
Turnaround time for customer service is faster with Smith & Wesson than Dan Wesson (by my experience).
1) Ours is hand finished & fit
2) We use name brand components
3) We supply a Proof target
4) Our 1911 is a straight 70 Series style, which is preferred by most shoots
5) Ours are available with more sight options, adjustable or fixed
6) We fit the rails of frame to slide in the hardened state to eliminated heat-treat distortion.