Hollowing & coring are two areas that I wish to expand my turning capabilities and setup in the near future.  I'm not sure which I'll prioritize, so I'm looking for any suggestions or advice on either topic.

For hollowing I've looked at both the articulated arm and captured bar setups, but haven't been able to determine if there's a true advantage for going either route.

Thoughts or advice?  Anyone willing to demo or allow a fly on the wall to watch/learn?