HT gets more and more complicated.

Man this sure gets complicated.

I recently upgraded from my old AVR to a new DENON 3803, and man, there are alot of formats out there.

DD 5.1
DD 5.1EX
DTS
DTS ES
DTS ES Matrix
NEO:6

for crying out loud. My last Thx cert AVR was nowhere near this complicated.

The worst part, is that the DENON 3803's instruction manual totally sucks.
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Here are some questions

1) Which is better? Dolby Digital 5.1? or DTS? Whats the difference?

2) I have a DVD audio player. Right now i have a coax digital interconnect connecting my DVD-A to the Denon, and i have set the DVD player to allow the Denon to do the decoding. Is this wrong? Will the Denon 3803 be able to properly decode the DVD-A discs, or will it decode the info as straight dvd? would it be better to use the 6 channel out from the dvd to the 6 channel input to the denon and let the panasonic DV-A7 DVD-a player do the decoding?

3) PCM is this Pulse Code Modulation?, is it a form of Time divsion multiplexing?

4) Im curious, my DVD manual says that i need to use BITSTREAM to send the data to the DENON. Then it talks about PCM down conversion where it changes the 96/24b signal to 44/18(i think). Is this degrading the sound quality? Does this actually convert it to a lower resolution signal? my DVD manual says i need to set the down conversion to YES.

5) does anyone who owns a DENON know what the AFDM option in the surround setup is? i cannot find anything in the manual about it.