Makayla Langmier, Maddison Gotezman, and McLain Ward!!!
I really love Alycia Burton. I think she is absolutely amazing!! She trains horses very well and because of her tackles riding she has a better position in the saddle.
It is difficult for me to choose one, I love several riders but for many of them I don't like everything they do ;)
I would say Luciana Diniz, I love her vision of the work of horses!