The GSG looks like fun. I may even buy one sometime. But for practical purposes (if owning a handgun in Canada can be considered practical in the first place) I would recommend the Ruger as your first pistol.
You can only use a handgun at a range. After a while you'll probably find that just casually shooting paper (or other targets where permitted) gets old. You may very well want to get into some kind of competitive shooting - bulls eye pistol, pistol silhouette, whatever is available in your area.
For match shooting the Ruger is a much better choice. It's very accurate and not fussy about ammunition. It is easy to mount a red dot sight on it and there are many ways to customize it if you want a lighter trigger, different grips, etc, etc. All kinds of Ruger aftermarket parts, including speed loaders, are available.
The horror stories about field stripping the Ruger are hugely overblown. Basically you just have to follow the directions closely. It's a bit tricky at first, but after a couple times you can do it in minutes.
For any purpose other than a practice platform for .45 ACP the Ruger would be a better choice.
On the other hand, no one stops at just one pistol. So if you buy the GSG you'll eventually have a Ruger too anyway
