UWA ... oh what can you do?
UWA lenses offer an "instant" panorama. Well, kinda.
The idea behind the lens is to provide the peripheral vision, which most lenses ... chop off. Theorectically, peripheral vision is your "warning" vision, where things do not normally register, but if there is movement ... it gets your attention.
Close in, obviously, you can fit more people in your image, at the same instant. Just as obviously, if you want a long, balanced and super sharp appearance to your image, you would take several overlapped shots with a 50mm and stitch them together. It usually requires a very cooperative subject(s) and a bit more time and coordination. Time here, is the problem. Most people aren't inclined to give the photographer more than 30 seconds, if that. The UWA does not need more time, but you have inherent distortions, which are a product of the lens design, itself. Sometimes (more often than not) you can counter these distortions with software counter-distortion features, but that also has some cropping involved, so make sure you have some buffer room in the corners of your shots, usually the lower ones.
Now I'm not discussing fisheye lenses, which have purposely accentuated the distortion of a wide lens and can offer some creative aspects to your images. The rectilinear lens is the type that offers the most "normal" look to it. But, the wider your go, below 16mm ... the more the distortion becomes apparent and has to be corrected for.
One of the best and least corrected images I've taken was of the roof of the Cadet Chapel, at the US Air Force Academy. It was a 10mm shot, but since I used the inherent distortion of the lens in a way that aligned with the perspective of the shot, no post-processing correction was really needed. (Get to know your equipment)
Here it is:
Not too many lenses give you this. Now, a 17mm on a Full Frame sensor should render a close one, but not on an APS-C sensor ... you will need the 10mm.