AFAIK, in the US Ultracoat and Oracover are the same thing -- are there regional variations?
My favorite for big planes is (US) Ultracoat. If you can stand rattle-can paint, you can paint trim straight onto it (or any other plastic film) with Rustoleum Gloss Protective Enamel -- scuff the surface first if the plane is going to live more than a year or so. Old Monocoat is fine, new Monocoat just doesn't seem to work as well. The various really light films (other than SLC) are a pain in the behind to work with, but stick to themselves too darned well. SLC is actually pretty fun stuff to cover with, although if you're covering a wooden model you may want to prep the wood with Balsarite or some such.