Andy Kerr:
Purely on performance, the Denon is better, but I don't think you should buy one. I've used one for the last year as reference, and I've found its slow loading times and lack of online access an increasing frustration as time's gone by. The Pioneer is simply a great deal more modern to live with, and it's hardly a slouch in quality terms, either.
The Denon DVD2500BT is a fantastic player, third only after the Pioneer BDP-LX91 (£2k) and Sony BDP-S5000ES (£1k). In pure A/V performance, it is better than ALL of the current blu-ray players. Yes, loading time is slow and it is a Profile 1.1 player.
It is not right that you should say to the OP not to buy one. It is for him to decide what he values more - best picture and sound OR faster loading times and interactive content, for his money.
Based on his post, I think all he wanted to know was the former.