I have to disagree on stabbing. I’ve seen too many problems. True, not every stab gives trouble but many of the issues I’ve seen were with stabs, from the late 1970’s to today. I’ve seen a lot fewer problems with screw terminals or clamps. I like stranded wire, it pulls easier & packs better into a box. A bit harder to terminate without a clamp device. Agreed on splices, they need to be done well. I prefer 4 wires max, 3 is better. As far as UL, their emblem is nothing more than a costly trademark. I have seen a lot of junk with their labels.