I get more opinions when I don't go anonymous but I feel that's because I have quite a few followers (it'll show up in their feed) and people recognise my username so maybe they want to help because they know me? I don't know. I get like two opinions on my anonymous ones, but it also depends on the question.
I would say it's pretty equal honestly. I think it depends more on the question topic than the anonymity of the asker. If the question is interesting enough or easy enough to answer (in the opinion of those looking at it, that is) then people are more likely to gravitate to it.
Yeah I think not being anon will pretty much always get more attention on a question unless maybe a lot of people are blocking that person. Obviously the more active and known users will likely get more answers as well.