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It's not really about UEL vs EL for sound (and nothing makes a UEL make sense to me, but hey...)
However, wall thickness and whether it has a catalytic converter both play a huge role in sound levels. It's got less stuff between the header and you no matter what (no heat shield,) but... how loud does it go is a pretty big range.
My setup gets a bit frustrating on the highway for road-trips (it gets loudest right around 70mph) but can be surprisingly quiet otherwise - if I'm careful about avoiding WOT and keeping overall load down. I've got the most help I could put on what is otherwise likely the worst possible scenario - catless header, thin walls, and a large pipe size all the way through; cat still on the front-pipe but high-flow, so there are two resonators stuffed in there and it's still a dual-exit muffler.
That said, the videos are rarely useful - too many compromises in both microphones AND in listening devices to really get a sense of how things sound. I think you just have to go find others with the same car that have various exhaust setups and find out for yourself.
dB levels have to be measured consistently to have much value. If people were really careful about it you could do comparisons but...
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