I've just purchased the 1909, which I prefer. The onkyo is said to get a bit hot, and the denon imo looks a lot nicer.
I spoke to richer and they said the Onkyo was better, but in my experience richer do have a nak for recommending whatever they have in stock rather than what is best, and they were sold out of the denon yet had loads of the onkyo.
Good luck finding a richer with the 1909 in stock, there is very limited supply. HiFI confidential have it in silver at £299 and ignoring what the website says they will ship it for free.