I have a 7x42 Leica BR (2004)that was repaired and optically upgraded by Leica a few years ago. I also have a 7X42 SLC that I purchased second hand after it was refurbished and upgraded with a new serial number by Swarovski.
The Leica is deadly sharp in the center field and, for most people, a solid performer. For me, the edges are often distracting and there's a bit too much CA in some circumstances. Eye relief is barely enough for my eyeglasses. If it was the only bin I owned, however, I could be content.
The SLC is better for me for a few reasons. Edge sharpness, though not perfect, is never a distraction. CA control is not perfect but it's rarely a problem. Eye relief is exceptional in the SLC. Weight is not a problem because I carry it bandolier style.
The SLC is my go to 7X42. I cannot part with the Ultravid but, truthfully, I don't use it very much. It's a great loaner!