Ron:
Which model Blue Ox's have you seen broken? Are they recent vintage? Ours is the lightweight aluminum Aladdin, and it is literally as strong as an OX. We had a problem recently, of poor spring adjustment (user lack of knowledge) and even when one arm stayed in the extended position, our heavy Ford Taurus station wagon continued to track well behind us, until we got to Pomona and the Blue Ox team readjusted it (and showed me what to do in the future). I could not be more impressed with a 23 pound hitch that safely tows a heavy station wagon.
I also know of several Roadmaster folks who have had breakdowns. IMO, either company does a great job manufacturing and servicing their hitches.
I went with Blue OX, only because the dealer who sold me the motorhome also is a Blue OX dealer. Either company would be fine I think.
However the Roadmaster tow brake has been known for problems compared to the Brake Buddy. I did see at Pomona that Roadmaster has some kind of new tow brake out and I have not heard reports one way or the other about their new brake. I believe I read it has proportional braking, and if that is true, then it would be a great thing to have. It was not on the market when I purchased my motorhome.