I can't find the blog post at the moment, but Brad McGehee wrote up a great assessment comparing the benefits of index reorganization with the costs of index reorganization and found that it just wasn't worth it. You're better of either defragmenting the index, or just leaving it alone in the majority of cases. With this knowledge, I'd suggest that, unless you're in a situation where the index rebuild is just failing completely, probably due to the size of your index, the load on the sytem, or both, you skip the reorganization and go with the rebuild.