I've been using Saicos for about a year or so now, and thus far I've been happy with it. I never tried Osmo, so I can't compare the two.
I have heard it said that the founders of Saicos had previously been at Osmo, but I don't have any info to back up that assertion.
I switch back and forth between Saicos and Rubio, depending on what the project calls for. Rubio has an enormous variety of tinted oils available, whereas the Saicos interior hw oil is only available in "pure", but it is available in a variety of sheens.
I've found that the Saicos oil doesn't "amber" lighter woods (Maple, Birch) as much as Rubio and other oils, so it's handy when matching existing pieces finished with a water-borne finish.
Application is similar to Rubio, but plan on two coats instead of the one with Rubio.