The combo wouldn't cover his need for a multi or the extra magnesium in Quiessence, so only combines joint and Omega supplements. I think it comes out the same, but you get a free hoof+digestive supplement, which is nice. One thing that might save you, I found that my horses were really only deficient in selenium and vitamin E, so instead of Quiessence+Smartvites, I started feeding a Mg+Se+E supplement, which was a lot cheaper. Then there's more money left to spend on joint supplements. If you can't afford the full joint supplement, MSM is better than none at all, too.
I wouldn't refrigerate rice bran oil--it hardens.