Which proprietary software do you prefer over their open-source alternatives, and why?

Affinity suite over any of their open-source competitors. I love Krita for painting, but for image editing, Affinity Photo is just so much better-suited and unlike Gimp, it's modern, actively maintained and has a much more thought-out workflow. I heard that Inkscape was fine, but I personally didn't like it either (but then, I also didn't really like Illustrator all that much, it's really a fully subjective opinion). But even if you did like Inkscape, you don't have the seemless integration between the products as Affinity does. You can create pixel graphics in Photo, import them in your vector graphics in Designer, and can seemlessly embed any of the two into your documents in Publisher. And each program has a special mode ("persona") that gives you the basic functionality of the others, and the UIs and workflows generally feel very similar and unified between them. For the hobbyist who doesn't want to pay for an Adobe subscription, it's truly unbeatable and the only reason I still need Windows every now and then.