There are some differences.
Pioneer has Faroudja DCDi processor and Integra has HQV Reon I think. There is debate as to whether a video processor in a receiver should even be used vs just native passthru and allow your TV to do the final processing to it's native resolution.
The potential biggest difference to me is the 1 HDMI output from the Pioneer and 2 HDMI outputs from the Integra. But so far I can't get a straight answer from Integra Customer Service as to whether BOTH of the HDMI outputs are active at the same time. I would really like to see a AVR or Pre-Pro that sends out signals to 2 different TV's at the same time.