I actually prefer "limit" but it requires knowing how to tweak to find the sweet spot in the curve for the song on the fly while riding gain on the input. I suppose learning to record vocals using a Fairchild 670 was what got me into this more hands-on approach to using a limiter.
I like both, depends on the singer and the song, like always. It's more important where you have your level, I can easily go into an LA2A 10dB, again it depends on the singer, for a barker it won't fly and you might need something faster, for a whiner the LA2A in limit with even the lower passages budging the needle back actually makes it sound like someone is singing. I prefer the UA175 because you can tailor it to each singer and it has a similar sound (tubes and transformers, optical etc...)
I liked using the LA2A in limit while doing vocal comps/tuning with a fader in front and back of it and an Eventide Harmonizer, set my monitor fader to 0 and put the vocals where I wanted them (playing off the sync head if I needed to advance them) the old fashion way. I actually hope I never have to do it again