I've used the Adox and the Maco Ortho films in 35mm, and in Rodinal 1+100, 11' for an exposure index of 25 was pretty good. I think they are the same film, but from what I've read the Rollei ortho is a different one.

At any rate, the advantages of true ortho films over pan+filter is that you get the extra-fine grain of ortho (always finer than Pan of the same speed) and the ability to develop under red safelight.