For sure, and I agree with you.
Of these tails I only still have the c9 157 and AFS 132
These are my measurements on the HA 38. It was too stiff/locked in for me. I sold it to someone learning to gybe and they loved it.

These are my notes on the Silk 132 tail, which has great roll but not so much for glide and the pump is really subtle.
TRADEOFFSRoll:
Both the UG41 and UG39 are dramatically better than the HA 38. The forward swept design shortens the fuse length and the tips are significantly thinner which give a much more playful turn than the HA 38. I like the UG 41 best on 900+mm span foils and am excited to see if the UG 39 works well on the e700 since it made the e800 so much fun on day 1. Once you reach the Silk 850 and smaller, I think the Silk 132 tail is best for roll. I think the 132 can be too much pivot for some peoples taste when using it on the 900ish span foils and the UG smooths that out.
Pitch:
I need more time to test but felt like the UG39 was just the tiniest bit uncomfortable up winding against the current on a big east wind day with the e800. There's a lot of water moving over the foils in that scenario and I expect that in west winds or open ocean that might go away. As soon as I collapsed the parawing and headed downwind any pitch over sensitivity vanished.
Pump and Glide:
Easily the biggest benefit of the UG tails. The no drag experience of the super thin UHA design decreases the amount of pumping I ever have to do and speeds up a foil like the Silk 1050 to the point where it becomes a very effective DW choice. I didn't give the HA 38 a huge chance here and the Silk 132 just doesn't have the DW capability I need when the conditions are soft. I've ridden the Silk 1050 a bunch with the ug41 and its a longboard DW machine.
Safety:
It sucks to ride scared so if you are nervous about the UG tail shape I'd say avoid it. No doubt, if you fall on it you will pay for it. The U Carve looks more forgiving.
vs the U-Carve:
I haven't ridden any of these but it looks very similar to my Mako Glide 120 with 35cm span. That tail, again, did great with foil spans larger than the Silk 850 (e700 and larger) but once you reach those smaller span foils there doesn't seem to be any HA/UHA tail that I like on them. At the moment, I'm more excited about the low surface area and short chord gains vs the low span gains for these glide shaped tails.
UG Tails: Best with parawing in mind and foils starting at e700 and larger (877mm span and up).
Silk 132: Best with wing in mind and foils starting at s850 and smaller (824mm span and down).