Junior

As far as 9mm vs 45. I prefer 45’s to shoot.
There is a difference in recoil to me. The 45 is a shove where the 9mm is more zippy. I have shot many different calibers over the years, and have stayed with a 40&W that I carry most every day. It is a happy medium for me. I really like 45’s but the magazine capacity is what got me. I can carry 13 in my sig 16 in the S&W or 8 in my 45. I don’t carry an extra magazine with me. I know I should, but just am too lazy.

On the Glock side.
You are either a big fan or hate them. I don’t think there is a middle ground on this one. I would suggest holding one, and pointing it at something before making up your mind. I personally hate them, but it is because they don’t fit my hands. This is my personal belief and backed by no fact, but I think that the Glocks were built as a replacement weapon for the PD’s so they have a grip angle closer to a revolver.