UJM- of course. OU is very straight about what they are maikil on and what they are machmir on. The are excellent at upholding the standards they have set. If you don’t like their standards go someone else at your own risk.
The hechsher for Shatzer were the same people who produced a smear campaign against another reputable hechsher for very unscrupulous reasons. About 20 years ago there was a meat-producing plant that did not give in to the strongarm tactics of this hechsher (call it hechsher A) so the plant dropped them. The other reputable hechsher (call it hechsher B) continued giving their hechsher and did not agree with the blackmail tactics. So Hechsher A ran a marketing campaign against hechsher B and said mozi shem ra against The Rav Hamchshir who is a major Tamid Chacham and posek.
I don’t see how anyone can trust a hechsher that uses blackmail and mozi shem ra as their modus operndi.