I personally think TSF ones are significantly better quality than Millbrook.
after personal dealings(Not leathers related) with the owner of Millbrook, I would rather burn my money then buy a product from her. My experience with her was one of the worst I have dealt with in the horse community. For what it’s worth I thought TSF was better quality before I had my experience with her.
She does not back her products at all. Honestly I would go with TSF just based on customer service alone.
Gary Mundy also makes these types of leathers as well.
I have a pair of Ovations and I have had 0 issues with them.