Pick two, buy both, and return the one you don't like. It's hard to make any meaningful evaluations of sonic quality based on input from other people.
Which is why I put the receiver/feature comment in my sig. Not so much because receivers will sound the same, but because there's no easy way to know how they will sound.
One theory is that room correction features would make the biggest difference in sound. So some may prefer receivers with Audyssey as they might feel Audyssey has put more time and effort into their system than say, Yamaha. But it's hard to say which system is better. I for one, and not 100% happy with Yamaha's YPAO, but I feel you can work with it and get good results.