I'm actually a bit jealous about the XReals. Back when I bought the Viture I wanted to buy XReal first but they had such strange shipping policies ( they shipped to every county around me but not to Austria ) so I went for the Viture.
With the viture I have the problem that the bottom of the screen is almost always not visible. I initially used the accessibility feature that let's me zoom into the desktop with mouse follow moving the viewport but that gets old quickly, which is one reason why I started that project.
I'm also planning to add other "display" modes like a curved monitor and in theory we could connect multiple monitors using several hdmi capture devices but that's probably even less useful
I haven't found a way to do it on the phone unfortunately which is really annoying.
You could in theory use the approach I posted here and use a USB to HDMI adapter to connect the phone to device and it would do the same thing it does with a regular PC but that loses all the benefits of being small and portable if you have to carry around all that additional stuff
The Xreals are the only ones I've tried, so I don't know how they compare, but I have trouble with fit. I have trouble in general, because of my nose bridge being too wide, but even when I put the glasses right against my forehead, I still can't get the entire screen in focus, the edges are blurry.
I really wish the screen were smaller and more to the center, then they'd be perfect. I guess it depends on whether you want them for games (the important stuff is usually in the centrer) or for work (the important stuff is usually at the edges).
I really like the focal distance, though, it's around 5m away and pretty comfortable for the eyes.