I can't speak for the other companies but now foods have always been good. I have used their MSM powder and it was great quality wise.

My doctor is on top of the latest top quality products and testing, since more than 5 years ago. He's always dealt with Metagenics so I've always recognized them as a quality company. I take a few things from them mostly just Vitamin D

I think you've pretty much listed them in order of superiority. Personal opinion.