The 667 would be my choice if you can easily afford it as it has more features
HDMI to HDMI Upscaling (480 input to 720 or 1080 output) 567 doesn't have this scaling capability on HDMI This is not a deal breaker though.
more important:
2 subwoofer outputs for the 667, one sub out for the 567
HDMI (In/Out) (6 / 1) Incl. front panel input for the 667 verses (4 / 1) for the 567
Pre-Out All Channels for the 667: none for the 567
Zone 2 output (audio only) on the 667, none for the 567.
There are others like dialog lift but thats not all that important.