I've not researched either. Nor will I, but I will recommend this: Choose one with multi-channel analog inputs (Disappearing breed, these multi-channel inputs, but still quite useful).
Having these inputs on my AVR allowed me to keep it, and save a bunch of cash by just replacing the BluRay player with a model with an onboard DAC. I use the analog transport to use the players DAC, and get great sound, no hum, no hiss... Via this analog transport, I can play both DVD-A and SACDs on a receiver that does not natively support these streams, and I'm happy as a clam.
Next time a new format comes out, I will do it again; just change the transport, not the receiver. I suggest you look into this particular detail, it may save you loads of dough later.
(I bought a
Oppo BDP-103, and kept my beloved HK AVR3600)