For the last few years, I have fed my mare a “whole foods diet” according the the understanding of my old barn owner, which is similar to this: https://www.biostarus.com/pages/whole-food-diet-for-equines
My mare did okay on this diet (hay + alfalfa pellets, flax or chia, rice bran, cool stance, camelina oil + supplements *no soy) but she is a hard keeper with mild PSSM. I also had to do a lot of supplementation, which was costly. And she never looked like she should.
I moved and am now feeing Seminole Dynasport, which is a higher fat, lower sugar extruded feed (NSC of 14%, fat around 15%) with soy. I no longer feed camelina oil or a vit/min supplement. She does get ALCAR + some other supplements still. She looks awesome, and actually gained weight over winter for the first time ever and is now being cut back a bit.
FYI, YMMV.
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