Interesting to see different likes & dislikes! Several recommend Cowboy Magic, but the smells turn my stomach and I've never felt a coat that didn't feel gunky, lol.
My favorites have remained consistent for decades: Natural hair brushes, non-metal combs, and Healthy Haircare Moisturizer for everyday grooming. Orvus paste shampoo, Quicsilver whitener, and Showsheen for whites/Pepi for everyone else at shows. Miracle Groom for last minute stain removal. I've yet to find other products that give me comparable results.
In real life want a vacuum.
In my dreamland, I want an Insta-Shed Spray that completely removes winter coats within minutes.