For what it's worth......
I have been a handgun gun owner for 40 years and have owned many brands. I started out with S&W revolvers and graduated to semi-autos. The brands I have owned have been S&W, Beretta, Ruger, Colt, Glock, CZ, Magnum Research, etc. No matter what brand I have owned, at the time of purchase I thought it was a good pistol or I wouldn't have paid the hard earned money. When you make the purchase, it is human nature to "support" that purchase. This is true in many purchases we all make. One person's opinion is just that, his/her opinion. Each and every gun I have purchased was a good buy in my opinion. As I shot and got used to the gun it was then that I formed the opinion of whether to keep it or not. Each person has a reason for owning a handgun....ie: personal protection, collecting, hunting, range use or many other reason that are personal to each of us.
Whatever brand you own is fine as long as it suits your needs. I have taken everyone's opinion of what I own with a grain of salt and leave it at that. I don't care what brand you buy, it is going to be decently made. Standards are too tight to turn out an inferior handgun in today's times as long as you are buying a reputable name.
I have chosen S&W's to be the main name in my safe because their product is varied enough to suit my needs. I like some of the Smith semi-auto's but won't buy some of their other products. It is a personal choice.
Many people want you to buy "just like they did" to help justify their purchase. Many instructors will also try to steer people toward certain guns simply for the reasons we have all read in this thread. One of the instructors I have encountered was also very high on Glock. We talked after the particular class I was taking and he said it was because 1. It was such a simple gun to own and operate and 2. Many people are new to gun ownership it is imperative they understand what makes it go bang. He told me he loathes advocating any brand but Glock seems to be the one that people can most readily understand. He also said the other brands like S&W, Ruger and Beretta are machine work marvels and it takes a seasoned owner to have the understanding to operate and maintain them properly.
I guess the purpose of this long post if to tell you that it doesn't matter what pistol you buy as long as you can shoot it properly, safely and you can maintain this weapon and keep it in proper firing condition.