I have both and recomment both in combination with the dimension strings.
Why? Because the Orchestral Strings play very unisono - less detuning here. The Dimension Strings are really closing the only gap here, cause you can add detuning by taste. But in generall the Orchestral-Strings offer much and are great Action-Strings too.
The Appassionatas play more detuned but the sound is "too perfect for the real world". With the Dimensions Strings added they sound more realistic and "meaty". But if you pay the audition credit, check the Appassionata Basses playing Tremolo ... BRRRRRRR ... just "MONSTEROUS"! I love the sound ;)
What I really miss are deeper suspence and horror effects which no string-section has VSL offers ;(. And for Filmscores you'll need them at a point!!
Other Firms offer these effects in their String-Libraries and the users love them. If you need/want these effects too, maybe you should wait for the Synchron Strings which MAYBE will offer them.