More IR and trigger ports, a fancier front bezel, and possibly some more/better integration for custom installers. At least, that's what I was able to find when I was comparing the two. The Integra also seems to be easier to buy right now as the Onkyo is out of stock in most places. I was actually going to buy the Integra last week because my local retailer listed it in stock, but doesn't even have the Onkyo on their website. Right before finalizing the sale, i asked about the TX-RZ50, was told that they had exactly one in stock, and I bought it. My price difference was less than $600, but still substantial.
