Uckele U-foundation versus sport horse pellets

I’ve been using the Sporthorse pellets for a couple years. I have been eyeing the U-foundation and wondered how palatable it is? Especially compared to the sporthorse pellets? It looks to be more concentrated, but I suspect that they may be using less proteinate minerals which is cheaper and tastes better? ( my girls will occasionally refuse to eat the sporthorse for a few days and then they start gobbling it like crazy)
The other thing that stands out is the u-balance has way less manganese in it.