I use UL, or no scrim on longbows(haven't done any recurves for a while).
I would think the scrim(ULS) glass would maybe be helpful on recurves for stability help at the tips.
Don't think you could tell diff in clarity,but had a bowyer tell me he has had no trouble with the streaks in ULS that sometimes show up in UL
The only #s you should gain would be in the .040 UL vs the .043 ULS(sometimes both called .040) .006 worth of glass will make a few #s diff if you don't adjust your stack a bit.