this is my viewpoint on SA XD platform. the XD's are a very good pistol, just that IMO the XDm is better version of a great pistol. trigger seems smoother, interchangeable grip backstraps and match grade barrels. recontoured slide and better sights. i just think of the XDm as an improved version of the XD!
now the SA 1911's. these are fantastic pistols. very reliable and very well built. range in price and features, to suit just about any budget. overall, in the whole scheme of things, i would put the SA 1911's as running close to Colt 1911's. i have nothing but high praise for Colt 1911's, so IMO the SA 1911's are definately top notch.