I've owned them both...they are both excellent stringers. The Roland RS-09 strings are a little thicker, that chorus ensemble is second to none. The Prelude has much more range and the brass, piano, and organ are not that bad . You would be happy with either one of them. If you are patient, you should be able to grab either one of them below $300USD.
"All we used was the explosion and the orchestra hit. The Fairlight was a $100,000 waste of space."