If you need the additional "Composer Assistant" tool, you will have to choose between version Octava Composer TS5, Octava Composer TS10, up to version Obtiv Octava Composer. Futhermore, these versions offer you the above described possibilities, but with additional COMPOSING function, which give you all composing assistance you wish. The only difference is the number off staves, which can be used. It increases from version Octava Composer TS5 (with 5 staves), Octava Composer TS10 (with 10 staves) up to version Octava Composer with an unlimited number of staves.
Octava Composer Professional is the "flagship" among all Obtiv Octava versions. This version is entitled as the "most professional".