With All American you need only make sure it has the weight. Even so, if it doesn't you can a replacement cheaply. I understand that shipping could be pretty costly. Is Ch.... err Canada really weird on pressure cookers because of bomb scares? If you have large amounts of produce to process the All American is better. I think you will like the Presto fine though.
It's not so much that we have an issue with them, as maybe they just aren't as commonly used? I dunno tbh. My grandmother for example, and many of her peers did a great deal of canning, but never with a pressure canner. I'd never take that risk, but that was just her generation (she'd be in her late 90s now, she passed away only a few years ago, and I grew up eating all of her foods. She was incredibly self sufficient. My dad, who inherited the home is still eating through the hoards of food stores she left. Anyway, I digress!). You can definitely find them here, it's just a bit of a pain, the options are a lot more limited (no all American definitely, have seen presto), and they are stupid expensive. For example, there's one small 16L in stock at a small town hardware store an hour away (none in any of the chains closer or in bigger cities, and they won't order) for more than it would cost, with shipping and exchange rates etc, to ship a 23L one from the US somewhere. It's bizarre honestly! I guess on the other hand, I live in a less populous province. If I was close to Toronto or somewhere big I'd probably have more luck in person. It's actually a pain to ship many things here. I'm trying to buy a cheaper air rifle from a US shop, but they haven't gotten back to me about shipping rates yet. An equivalent cheap but reasonable quality rifle here is double the price (or more) even after exchange rates (and I don't like the look as much), so I'm trying to buy online. We have them available here, but as with many things, there's just more options down there! You guys have more people by far, so it makes sense.