Many moons ago, my brother-in-law gifted me with Corel PaintShop Pro and I've been using that. I upgraded a couple of years ago and there have been upgrades since then, but so far I haven't seen the need to keep getting the latest upgrades. It's not too bad as far as cost. The latest version is x8 and it goes for $100 on Amazon, but that means version x7 is now on sale for $50, and I can almost guarantee there are very few differences. If you were the type to do massive editing on photos, perhaps the differences would be more noticeable, but otherwise, meh.
I've downloaded Gimp but haven't really gotten the hang of it. To be fair, though, I haven't put in a lot of time trying to figure it out. If I become dissatisfied with Corel or if it crashes or something, I'd probably switch to Gimp as my primary editor.