Mobilin

i can't understand if MOBILIN is the same like Ubuntu REMIX ?

I have not tried the Moblin Remix myself. However, I do know that they are not the same thing. Ubuntu Moblin Remix integrates with the Moblin software stack and interface. Ubuntu Netbook Remix utilizes the Netbook Remix interface.

so what is better?

It's not a matter of better or worse, they are just different. UNR is just ubuntu/gnome with a new layout, so it is more stable, but Moblin does some nifty things too. Why not try both? You can test them from a USB stick without installing anything to your comp.

Not to make things too confusing, but there is a third option now as well, since with Karmic there is a KDE netbook version as well.

Well, but it seems to be based on MOBILIN the UNR . *All of the initial Ubuntu Netbook remixes combine optimisations from the Moblin project for Intel® Atom™ processors and it is specially designed for netbooks. Intel and Canonical are working to create a new computing experience across a rapidly expanding category of portable devices.*