I had the SGS21U and the only advantage it has over my GP6P is the long camera lens. What about call screen, direct my call, and hold for me? Those are either non-existent or no match against the GP6P. What about Bixby annoyingly begging for attention every time you talk to the SGS21U? What about how horrible Bixby off the rip? You talk about one little extra button press to hit wifi, but completely ignore all of the duplicate apps made by Sammy that mimic the superior Google apps? What about Sammy pay and always having to enter your fingerprint when you should be able to just tap and go? You only need to hit your fps once with Google pay on the pixel, but you have to hit it twice with Sammy. The SGS21U is heavy and difficult to manage with one hand. The UI definitely lags. What about setting a timer using the Google clock app and Sammy rarely sounds the alarm when the time is up? I know I know, use the Sammy clock, but I like the Google clock ten times better. I don't need 20 different options on a Sammy clock to set a timer. What about having to give 50 different shady vendors your credit card information just to buy 50 simple themes because the included wallpapers are complete trash? Shall I go on? Heck, the Sammy screen is barely better than the one on the GP6P. When it comes to the stereo speakers, the Sammy sounds tinny.
The GP6P post January update provides a significantly better UX than Sammy.
But, here's what I really don't like about Sammy fans, they literally base their self worth on owning a Sammy device. They have fragile egos and suffer from little brother\big brother syndrome vs the iPhone users.