Glocks are outdated. Check out Springfield Armory’s XD.
At this point, you shouldn’t pick out a specific company. Go to a gunrange that rents guns and find one where your fingers can reach all the bells and whistles. Don’t buy any defense gun smaller in caliber than 9MM.
A bold claim. What does the XD do that a Glock doesn't?
The G19 is a straightforward and solid tool. Pull trigger, go bang; don't pull trigger, don't go bang. Capacity is fine, no complexities (manual safety, mag release, loaded chamber indicator), sights are fine, easy to maintain, etc. - the usual litany of "it just works". I'd like to know what alleged improvements could be made.