You're right: Spiros are more popular for jazz than orchestra. But they were initially developed as an orchestra string to have the quickest response under the bow. For most folks, however, there is just too much zing for arco. But depending on the bass, they can be a viable option, especially an E string underneath something else.
Now, seriously - you may prefer one of the Pirastro offerings instead. Also, if you don't mind the Pirastro bias, Ken Smith's bass forum talks extensively about orchestral issues, and a perusal of the threads on his forum may also give you some ideas about string preference, as Ken seems to change strings and basses frequently, including the entire range of Pirastro, and since he is also a luthier and bass shop owner as well as an orchestral player and the builder of his famous line of electric basses. He is well versed on how different strings react on different basses, and you might find something there that will benefit you.
smithbassforums.com
Now, seriously - you may prefer one of the Pirastro offerings instead. Also, if you don't mind the Pirastro bias, Ken Smith's bass forum talks extensively about orchestral issues, and a perusal of the threads on his forum may also give you some ideas about string preference, as Ken seems to change strings and basses frequently, including the entire range of Pirastro, and since he is also a luthier and bass shop owner as well as an orchestral player and the builder of his famous line of electric basses. He is well versed on how different strings react on different basses, and you might find something there that will benefit you.
smithbassforums.com
