Albert, The receivers you mentioned are both capable and will not disappoint. Either one will serve you well, starting a poll on which one is better is pointless and will prove fruitless as one will be recommended over the other through a person's own preference.
You will have to make that decision on your own.
They both have excellent power supplies and have ample current to drive a lot of speakers on the market. What speakers will you be using? This will also play a role in your choice.
Personally, I find the Denon a little sterile compared to the Pioneer Elite series.
The speakers that I have are the Polk RTi10 and velodyne DLS-400R subwoofer. and have the center speaker and surround speakers but I might upgrade to better ones (probably the polk Csi5 for the center and FXi5 for the surround speakers.
