Glocks are actually pretty good guns. They even have models in .45 ACP. Polymer guns are legit, be it Glock, Sig, Springfield, or S&W M&P. The old standards of Colt, Ruger, and S&W aren't the only ones to go by anymore. I'm still apprehensive of anything made by Taurus though.
Here's some fun stuff about the 9mm vs. .45 ACP debate:
https://en.wikipedia.org/wiki/Thomps...3LaGarde_Tests
https://en.wikipedia.org/wiki/1986_FBI_Miami_shootout
http://www.defensivecarry.com/forum/...hard-data.html
http://www.tactical-life.com/gear/45.../#bsum-buffoni (dubious source)
http://looserounds.com/2014/09/21/fb...ning-division/
http://backwoodshome.com/blogs/Massa...4/01/20/memes/
http://blog.cheaperthandirt.com/9mm-...y-replace-9mm/
http://www.grandviewoutdoors.com/gun...-pistol-round/
Something tells me this debate won't be settled anytime soon, barring the introduction of phased plasma weapons in the 40-watt range.
In general, loading 9mm +P in 127-147 grain hollowpoints (if even an option in your state) will do a pretty good job against a person. .45ACP +P in 230 grain is generally overkill. Being able to stop a dude cranked out on meth and PCP with either in one or two shots is dubious unless you've trained properly and extensively or get really lucky. Even then, not so much.
If you're shooting cheap ass Blazer rounds out of either, your mileage may vary.