I don't know what kind of neighborhood you live in, however it is terribly irresponsible to have a weapon that you leave in the car. If you're going to take it, wear it. That said, I have just as many friends that are pro-Glock and I have that are pro-Springfield. I read an article recently that made alot of sense given today's manufacturing processes. With the advent of Glock, which their CEO began trial in an extortion case in Atlanta today, firearm manufacturers really had to begin competing on price moreso than they had in the past due to the processes and materials Glock uses. Whereas in the past, you purchased craftsmanship and quality, now you purchase marketing time because the playing field is pretty level nowadays. Go to any Glock forum and you'll read threads of FTF (failure to fire) and other problems, go to any Ruger forum and you'll read threads of mag release and other problems, and go to any S&W forum and you'll read about trigger and other problems. That said, manufacturers have undertaken the business model that with pricing, issues can be dealt with on a one or two off basis if they arise within the warranty periods. It is more rare today than in previous times that a weapon would be fired 10,000 rounds and it is more likely, especially with today's ammo prices, that a weapon will only see a couple thousand rounds at most.
Cliff notes: opinions you hear will range widely, however the reliability of either of those models you proposed will be about the same. I would suggest you go to a firing range or find a buddy that owns one or both of them or where you can rent one and give them a try. See which fits your hand best. See which is most comfortable. Glocks have a tendency to feel narrow to some people (laterally) and Springfields sometimes feel too thick (lineally). That said, I've owned multiple and shot many more Glocks than I have Springfields. Women sometimes have issues with ejection failures with Glocks due to limp wrists. If yours is more on the supple side, you should be fine.
My current carry weapon is a Walther PPS 9mm. Don't get too caught up in mag size either. Any gun fight requiring more than a couple rounds from your weapon is larger than you should engage in - you need back up at that point.
olice: about 20 minutes or so to get there. 
