The MOTU has 12 in/out vs 16 for the PT192
(although the PT 192 is split between 8 analog and 8 digital.)

There are also a few other digital in/out options on the PT 192

Probably the biggest difference is that the PT HD 192 works with Protools and the MOTU doesn't.

Pro Tools HD systems provide their own processing power for plug-ins, whereas MOTU systems are primarily native systems.

UncleBob58 wrote: Pro Tools HD systems provide their own processing power for plug-ins, whereas MOTU systems are primarily native systems.

I'm pretty sure that's not the case in this case. The motu HD comes with a processing card. How that works with other DAW's I'm not sure. But Motu has it's own DAW program that seems to utilize this card.

...

And how about the converters? Are the ones in PT192 better than the ones in MOTU 192?

Unknown.
Need to find someone who has compared both.

in all honesty I personally think digidesign is a gimmick in the most sense, they make great equipment, but that motu would still work great on something like nuendo or cubase and could kick protools in the balls if you know how to mix right..

Probably the biggest difference between the MOTU HD and ProTools HD is the ProTools HD card has 9 DSP chips for plugin processing power.

Now if you're just talking about the Digi. 192 A/D converter compared to the MOTU, you can buy the MOTU which comes with the pci card for the price of the Digidesign 192 i/o alone. So you would still need to spend another eight grand on the PT HD card.

well, I've been asking and wondering around exactly for that, cause I cannot afford a Pro tools HD system as I need it, which is with a lot of analog outputs, so the Motu HD is the option, I've find out that the motu hd192 is not as good as the PT192 (eventhough a lot of engineers complain about this PT expensive cards, and claim that the Aurora's are much better sounding and cheaper) anyway, the point is that I've found out that the apparent reason for PT 192 to be over Motu 192 is the clock... so the tip is to get a great master clock and use it with the motu 192 system and it would be a lot closer to the PT HD sound... as I been told anyway,

and I actually will get it soon, I hate not working with protools at the front end while I mix, but I mix OTB anyway so... I hope it works