I have an Onkyo, no issues so far but my two year old Pioneer 919 died. All electronics aren't as well made as once upon a time, they have limited life, some may last a few years, some many. Forums have more complaints from the anal than praise from the general consumer. Depends on use and environment, too. What's the specific watt difference, is that an rms per channel difference or some peak figure difference? Consider it takes a doubling of wattage to raise spl by 3db, small differences mean very little in real output terms but will depend on the efficiency/sensitivity of your speakers. With an avr now I would be more concerned with having pre-outs for use with power amps as needed, features for connectivity that work for your setup, and what room correction software is built-in....as long as it has say 70-120 w/ch not a huge difference in spl in most cases.
"I realize that somebody playing free music isn't as commercial as a hamburger stand. But is it because you can eat a hamburger and hold it in your hand and you can't do that with music? Is it too free to control?" - Don Van Vliet (aka Captain Beefheart) discussing commercial success in the music biz