Createspace Versus Lightning Source

For self-publishers, choosing between Amazon's Createspace print on demand service, and Ingram's Ingram Spark/Lightning Source service can be difficult. Both services have their pluses and drawbacks. For fence-sitters, here's an article that argues uploading to both services is a good idea. An author client recently indicated this approach was working well for him, and we'd be happy to hear opinions either was other print on demand using authors.