I used to own a GLOCK 17. I sold it because I didn't really like it that much, although I am considering getting a 19 to try something different. I have shot a SP2022 in 9mm in a kind of "taste test" side-by-side comparison with my SIG 229, and it stacked up quite well against the "classic" SIG. The 229 is the better gun, but the SP2022 takes the SIG 220 idea and morphs it into a polymer gun, and the result is very nice.
One thing that is a bit strange with the SP2022 is that it isn't really very light (30.2 oz). Many poly gun makers like to trumpet how light their guns are for carry purposes. The SP2022 is within a few ounces (like 2 ounces) of the 229 (32.4 oz) and 226 (34 oz) guns - whereas a GLOCK is probably 10 ounces lighter (I checked, it's 22.04 oz). For use at the range, heavy (within reason) tends to be a good thing. For cops and people that have to carry guns around all day, light is a good thing so they don't develop back problems and whatnot.
The things the SP2022 has going for it in my mind are: better ergonomics, better grip angle/pointability, better sights, SA trigger is easier to shoot accurately, more accurate overall.
The downside is: you have to de-#### it to holster it, and therefore you have to master two trigger pulls to shoot with a holster. This is no problem once you get used to it, but newbies tend to struggle with this. Carrying a SIG (other than an SAO model) around in a holster with the hammer back is not a good idea, and I can't imagine any range officer being fine with that if they notice it.
For the GLOCK: some people really like that grip angle... I don't know. The gun feels really front heavy to me. I don't think they are all that accurate with the stock barrels. They are built for total reliability, not accuracy. I'm also not wild about the triggers on them. No matter which connector you use, they feel mushy and unpredictable to me. The stock sights also completely suck in my view. I would never get a GLOCK unless I at least got the OEM night sights or some Meprolights or something like that.
The upside is that they are dead simple. You take the gun out of your holster, you pull the trigger, you fire it, you put it back in the holster. It seems to be one of the easiest guns to get up to a basic level of competence with (hence it's popularity with employers who have to train people to use firearms).
Both guns you can get parts for from Brownells, so you don't have to beg your local shop to order something for you from the Canadian distributor. Mags, holsters (and all parts and accesories) are going to be more common for the GLOCK, but SP2022 is not hard to get stuff for. You just aren't likely to walk into your local shop and see it on the shelf.
Between those two guns, I would probably give the nod to the SP2022, but definitely try both, or at least handle both, and try to get an idea what will suit you better. For me, the SP202 is going to be pretty much good to go out of the box. Again, for myself, I would not use a GLOCK with stock sights, and I would probably want to get some trigger work done.