for my Pecheron due to the high fat content (20%), but currently I use Triple Crown 30%
for my Haflinger, as he gains weight easily and I want to give the most nutritional bang for his calorie buck. Currently he is not on any ration balancer as I am concerned about him gaining too much weight.
My mare is an easy keeper that doesn't need the extra calories from a ration balancer, as she has enough pasture to sustain her year round. Thus I am feeding a condensed vitamin/mineral mix from smartpak.
We feed 1 lb of Triple Crown 30% Ration Balancer and our four easy keepers are always super healthy, with shiny coats, hard hooves and healthy guts. If you compare labels, it gives you the highest concentration of micronutrients. I also like that it has pro- and prebiotics for gut health.
I use Purina Enrich. I used to use Empower but my horses weren't crazy about it, frequently left it in their buckets and they were losing weight. Purina Enrich Plus seems to agree with them, they eat it all, like it very well and nobody is thin. My choices locally tend to be Nutrena, which my horses don't care for, Dumor which makes them lose weight and they're not crazy about the flavor and Purina. Of the 3, Purina works best for them.
I've just started using the Purina Enrich. The hay quality isn't as good as what we normally get so I wanted to add some nutrients to their diet. Cost wise I think it is cheaper than most vitamin/mineral supplements.