Tex has it right. Nutnfancy does like the Glock and uses the Glock (specifically the Glock 17) as the standard by which he compares other similar handguns (SR9, S&W M&P, XDm, etc.) that he reviews. As Tex points out, he not only praises the Glock, but also praises the S&W M&P. This is true of the Sig P226 and H&K as well.
Also, if you watch his reviews, you will see that Nutnfancy approaches his reviews of handguns as well as other items he reviews from a "tactical" viewpoint. For instance, he places a lot of importance on the weight of the handgun, the number of rounds available, the durability of the handgun, the reliability of the handgun, and the accessories available (like lasers, lights, magazines, aftermarket sights, etc.).
I for one appreciate Nutnfancy's reviews. He puts a lot of time into his reviews (his own time) and I find that his reviews are very thorough (I like that he uses a set of written talking points), clearly filmed (good video quality), and very informative. I especially like it when he compares the various similar handguns. You just have to remember that he is presenting from one viewpoint, and some features of a handgun that are important to him may not necessarily be important to you.
Personally, I do not own a Springfield XD or XDm, but I do own a Glock 17 and a Sig P226 (9mm). If I had to choose one, I would choose the Sig over the Glock everytime. I know several guys who own the XD and they love them. It just goes to prove that the handgun you choose to shoot is a very personal choice.