Carried a Glock 22 for years in L.E. & now that I'm retired, I use a Springfield XD. I consider the Springfield to have all the positive features of Glocks along with added improvements.
Looks to me like they started with the basic polymer frame/stricker design & added a grip safety like a 1911, loaded chamber & cocked indicators that are easy to see while drawing & presenting the weapon as well the ability to check these indicators by feel in total darkness.
The original Glocks didn't allow the magazines to drop free (typical on European designs) & even though I've never had a problem with a Glock mag. I still prefer the stainless steel Springfield ones. More weight & the smooth stainless glides against the polymer frame for smooth mag. ejection.
The XDM models are even better, with match grade barrels standard, better triggers, increased capicity, & adjustable backstraps like S&W introduced.
In short, a Glock today is pretty much the same as a Glock from ten or twenty years ago, while Springfield continues to update & imrove their products, which is why I prefer them. Still have two Glocks (a 10mm Mod. 20 & a .40 Mod. 27) but they stay in the safe while I continue to carry & compete with a Springfield 5 in. Tactical. LOVE it ! ! !