I currently am running M1 15w-50 in my '93 900SS and I am pleased with the performance and am confident that this lubricant will give good protection. As a bonus, it is universally available at a good price.
I am sure the Motul and Agip oils will also provide excellent service. Ducati engines and transmissions share the same oil and as a rule run dry clutches except for a very few of the new models.
Here is a link that will probably provide you with all the reading you care to do on the subject of Ducati's and motor oil: