I don't like Glock at all. But I freely admit that this is a superficial dislike based entirely on the weapon's appearance. I simply hate their blocky appearances.
However, Glock didn't get their reputation and huge following by their appearances. They got them by being darned good pistols...they're reliable and accurate, with added characteristics that make them good concealed choices...like being hammerless, for one.
On the flip side, I like Walther superficially because they've made some really beautiful (in my opinion) weapons.
And Walther hasn't been around for as long as they have by producing cr*ppy weapons, either. They're one of the finest manufacturers of pistols in the world.
Just from a quality and reliability perspective, you're not going to find any practical difference between the two.
My advice is you go out to a gun range, or get together with some people you know, which have both these pistols available to shoot. Handle them. Shoot them. Look into the avaiilability accessories you think you'd like to buy (added magazines, grips, etc.).
Remember: a gun which isn't comfortable in your hands is a gun you'll never really be happy with, regardless of how it shoots or what you paid for it. Find the one that best fits YOU that YOU are happy with.
And everybody else who doesn't like your decision can bugger off, in my opinion...they're not the ones who will be carrying and shooting your gun.
Best of luck! And drop us a line to let us know what you got and what you think of it.