I don't know if things have changed but I only used F-Droid as a way to get packages and update them. It's worthless for trying to find an app. The descriptions are terrible and often misleading ("Pubic transit schedule app!"...that turns out to only be for one specific scandanvian trolley system...) the search function is terrible and there's zero user review or rating system. F-Droid also has no e-commerce functionality.

The vast majority of software on F-Droid is My First Android App garbage, usually doesn't follow any common best practices for UI/UX on Android, is extremely specific (like a door-opening app for a hackerspace in Germany) or all of the above.

I don't see how you could possibly compare them with a straight face.

The one or two times I've found an app on Apple's app store to not be up to snuff, getting a refund was completely painless and Apple is known for being pretty liberal about refunds, because I think both they and app developers realize that a smooth exit for an unhappy app customer is the best for everyone involved.

The paid apps I've bought on iOS have been miles better than Android apps, too. I was shocked to discover that an excellent Solitare program I used on an original iPhone is still kicking around getting regular updates from its developer. It shows one ad, briefly, after a game win (I think it doesn't even show an ad after a game loss.)

Most of the stuff I bought on Android? The dev abandoned it within a year or two, and then it broke not long after...