Just picked up my first surround sound system and loving it already.

Naturally it supports DPL II and Dolby Digital 5.1.  Tried a few wii games and a few DVDs with it and it all sounds amazing.

Its amazing how much better DPLII makes pure stereo sound (Radio/CDs/MP3s.)

The DVD is integrated with the receiver so it implements DD 5.1, and I have digital audio coming from my cable box so that will use DD where applicable.

My Wii naturally uses DPL II.

I would like to know who else has a surround sound system set up and those with both a Wii and 360/PS3 if you can give me anecdotal evidence as to the comparison between the SS with DPL II and DD 5.1

The only comparison I could do was between PL II on the wii and stereo output with the DD of the DVDs.  Poth sounded phenominal to me.

Please, no fanboy rants on either side, I would like some real anecdotal evidence and some intelligent discussion.

Honestly I can't tell the difference under normal use unless I jam my ears up against each speaker individually. DPL Is basically Stereo sound split up into 5.1. And 5.1 surround sound is just that clear and simple. There is a small bit of quality loss in DPL but unless you've got a 5,000$ sound system you really won't notice the difference.

Does the PS3 or 360 support DD 6.1 or 7.1?

Hm, well, I've had surround sound setups for years, and I think it's phenomenal compared to standard stereo sound. However, I don't think DPL II is that great. I use it for my Wii and did for my 'Cube, but ever since the first time I fired up a game with DPL II surround sounds, I've been thoroughly unimpressed. DD 5.1 and DTS work awesomely well, but PL II's just extremely inferior in my opinion..

How so? Sound quality? Channel separation? What exactly do you find poor about it?

Granted I have yet to have a lot of experience but DD and DPLII seem comparable.

Digital always sounds a like more ambient than Pro Logic in my opinion, which makes a noticeable difference for things actually big on surround sound. But they’re both fine.

Doing 5.1 or better tends to take up system processor I think(I'm not 100%)

 Dolby Pro logic II is nice in that it provides a 5.1 experience(better than stereo) but it doesn't come out as good as 5.1 source material however it doesn't use much/any of the systems processor to provide it which on the wii is actually a pretty good idea.

http://www.dolby.com/consumer/technology/prologic_II.html 

The biggest difference between true digital 5.1 and Pro Logic II is the use of the subwoofer. It seems, with Pro Logic II, there is just not enough low end. As far as the sound goes beyond that, it is up to the programmers how the sound will work.

For example, Eternal Drakness on Gamecube has probably the best overall use of surround sound I have ever heard but Call of Duty 3 sounds amazing in a different way.

The use of surround sound is probably more important than the fact that the game has surround sound. If that makes sense.

In a game, I've yet to hear a difference between DPL II and DD 5.1 or DTS.
I mean, there's a difference but you won't notice it.
The best sound I experienced was in Tales of Symphonia on Gamecube, as it's heavily used in combat for example, and it's pretty noticeable where your characters are for example.
And my subwoofer never got used in any game, so I think DPL II is enough for games.
Surround sound is poorly used in games anyway, and you need a well calibrated system to really enjoy it, which few people do anyway.
As a matter of fact, it's true that DPL is slightly more than stereo (it's 3.0), but DPL II is another beast that actually delivers 5.1 sound.
The demo of Uncharted even has DTS, and it didn't make a difference. I'm overreachin, as the ambiant sound is subtle in Uncharted. Anyway, you can't really compare, that makes no sense, like with movies.

Yeah, well the channel separation is a bit less. But more, it's like GhaudePhaede010 said, the subwoofer. DPLII just doesn't seem to pack as much.. oomph. Don't get me wrong, I think PL is alright, just that DD and DTS are far better. In my experience.