Late to the party, but I'd suggest that you have a look at some of the reviews that compare the various options to Photoshop and Lightroom. There are some significant pluses and minuses when it comes to LR replacements - the file system/catalogue system differences are significant between LR & ON1, for instance. For more on that see:
https://photographylife.com/lightroom-vs-on1I now have Capture One 12 Pro, ON1 2020, Affinity Photo, and Pixelmator Pro, in addition to my old LR/PS CS6, which are still in use. I haven't updated to Catalina, as I've had a number of big projects and not enough time to do anything...
Capture One 12 compared to Lightroom:
https://photographylife.com/lightroom-vs-capture-oneCapture One had a great sale before Christmas; I'd been dithering over it for some time. The other apps I've owned since they began and I have updated them (thought not used them extensively, yet) because I believe strongly in supporting viable Adobe alternatives!!
ON1 is significantly cheaper than C1 and will likely be more than enough for many - though DO keep in mind the differences using a database/sidecar DAM structure and make sure that you know and understand best practices around backups.
If you are looking for a viable Photoshop alternative from a great company with a good user base (and helpful forums) I HIGHLY recommend Affinity Photo. I also use Affinity Publisher - have already abandoned InDesign (which I used and loved for years) and it's great too.
Comparison:
https://www.photography-raw.com/affinity-photo-vs-photoshop/For those considering Pixelmator, this is a good comparison of it with PS:
https://tidbits.com/2019/02/13/pixelmator-pro-how-does-it-compare-to-photoshop-cc/