This saying comes along a lot with new people asking, "What gun should I get?" Well, some guns feel more comfortable in your hand than others and that's the best way to tell a new shooter how to pick out their first gun.
Personally, I hate Glocks, they don't feel good in my hand so I won't own one. I do think that if a Glock feels the best in your hand, then that's what you should get.
I picked up a CZ 75 and instantly knew I had to have it. I also picked up a Kahr CW9 for my first gun because I liked how it felt initially. I ended up deciding I wanted something else a year down the road and got a K9 instead, based on things I found I liked and disliked about the CW9. Your opinions will change but that initial feel is something you can't fight off when looking for a new firearm.