The good Lord knows I'm no brand shill. Quality differences just can't be proven. Tradesmen who think they know otherwise need to learn the term "anecdotal evidence".
However, features are another story. I had a customer who wanted quiet above all else. I told her that I had never installed one, but a bunch of fanatics at HVAC-Talk thought Rheem's Mod was the second coming. (Seriously, that was the sales pitch.) She said to install it. I did. She loves it. I think I do too. It's as quiet as a church mouse most of the time and ramps up like a mother when it needs to.
In terms of quality, for all I know the thing could be a POS that's going to cost me a dozen warranty calls. But in terms of how it runs, it's a beauty.
Others are welcome to correct me on this, but from what I've read other OEMs just haven't stepped up to the plate with the same functionality. Either they use board logic instead of a thermostat, or they don't have a SA sensor, or they don't have real modulating valves, or whatever.