I don’t know much about Affinity Photos on the Mac but I do on iOS. I guess there aren’t a lot of differences. I know quite a bit about Luminar and I like it. Pixelmator is nice too, better design than the others. I always think this is something Apple could have designed back in the days of the beginning of the iPad. Photos? Nice for browsing, syncing but bad for processing… UI is too messy to my taste.
Please, read this Twitter thread to find more responses following the Twitter poll.