I think just like most manufacture, there are good, bad, and so-so products. I don't actually have anything from any of the manufactures you mentioned, but they are the more popular options. That doesn't mean one is really any better than the other. It is all opinion.
I mean crash guards "tested" by one rider may not fair as well when "tested" by another.
A bag is a bag, and one guy may like the pocket here, the other there. etc...etc...
From what I have read, the guys you mention all make good stuff. Find what you like, look for reviews, and buy it if you think it is good. That is the beauty of having so many options.