I've never managed 2133 prime stable at 9-10-9-28-1T, tho I can boot and do limited benches, so yeah thats a possibility but mega rare though. When every samsung stick does 9-10-10 with ease there's really no question which one you would chose if you were buying blind.

Micron or Samsung is a MUCH tougher choice, though he was only asking about hynix or samsung...