Better is a relative term. It's what will sound best to YOU. I have the Yamaha RX-V371 receiver and have been very happy with it. I think the only difference between the 371 and the 373 is the auto-cal on the 373 and a front iPod connector (?). Onkyo makes good systems but there have been some reports of issues (but any mfr can have issues from time to time). I think the Polk speakers matched with the Yamaha RX-V373 would probably give you a better all around sound stage than the speakers that come with the Onkyo or Yamaha HTiB (or any HTiB for that matter).