AlfaBeet or Molassed Sugar Beet? Barley rings?

[floradora09]

It's feeling a bit autumnal now and I'm starting to plan what to feed my 16yo TB this winter. He lives out, he's not a poor doer but does drop weight if not fed lots. What are the benefits of feeding the above? Last winter I used speedi-beet but wanted something more conditioning for this winter. Which is more digestible and has the most nutritional benefit? What about Barley rings?

For the record, he'll also be on Baileys no.4 and Alfa oil.

Thanks!