A small correction, the HRX is not a commercial mower. Honda's commercial line is the HRC series. Looking at the rest of the model number, I assume you knew that and just typed x instead of c.

I use the HRC216 (various years) whenever I help my father-in-law with his landscaping. In general, they are excellent machines. The only major issue I have is that if the grass is very wet it will clog, but it has to be pretty wet for that to happen, and the grass has to be very thick. At any rate, it is annoying. Another small annoyance is that when you take the bag off, you will spill clippings onto the lawn or concrete or wherever the mower is parked. Other than those two things, the mowers are great, and make it very hard to come home to my old hand-me-down Homelite.

As for popularity here (in my town) among landscapers, I would say that Honda has the edge. Are you going to use the mower for commercial purposes?