Price, (perceived) ugliness and an underwhelming camera compared to what was promised.
Also, Samsung uses the inferior Exynos chips in the S20 phones released in Asia. Exynos is crap, Samsung should stop trying to be clever and reinvent the wheel. Same goes for Bixby.
In any case, we'll know once Samsung publishes its quarterly financial reports.
The corona will be a convenient scapegoat.
If you don't mind the 'locked down' Apple ecosystem, buying an iPhone makes more sense these days. Timely and mostly trouble-free software updates for at least 5 years, higher resale value, and quite likely cheaper than an equivalent premium Android phone these days.
Other than a few notable exceptions, most premium Android phones have removed the headphone jack, so Android's moral high ground regarding that is gone.
Google Maps is available on iOS, and I don't miss anything else from Google. Duo is inferior to Facetime, and I refuse to install Skype or anything from Microsoft. I'm not interested in the so-called 'customizations' or nerdy hobbies such as loading a custom ROM.
Google Assistant is better than Siri, I'll admit that. But Siri isn't as terrible as Samsung's Bixby.
So what exactly is the compelling point of sticking with Android?