As a rule, yes. Both Apple and Google are horrendous stewards of their respective storefronts. Their review processes are infamously capricious and black boxes, in the case of Apple they put additional moral rules on what the app is allowed to do, and in spite of that capriciousness, scamware still regularly makes it's way onto the App Store. (Scamware defined here as having a specific set of anti-features[0] that a user would ordinarily pay to remove.)

This one isn't even hard to argue against; Apple being a good steward for its storefront was true in 2011. It is no longer true today. I'd consider a tech-illiterate user less likely to randomly lose a lot of cash by using different storefronts from the Apple App Store (or again, the Google Play Store), if only because those different storefronts actually do a bit of curation instead of focusing on quantity over quality.

[0]: Most of the ones listed here apply that aren't "non-free dependency" or are meant to be a category filter like NSFW. I'd also throw in "microtransactions to unlock basic functionality", but F-Droid effectively bars those with other inclusion rules. https://f-droid.org/docs/Anti-Features/