Simcha613- I believe it is actually the opposite, sefardi shechita has more chumros than ashkenazi, but Ashkenazim don’t actually realize it. But again, not all sefardi heshsherim are equal, and there are some sefardim who won’t eat certain sefardi hechsherim.
There are two things one needs to know about a hechsher- a. the chumros/standards it follows, which is why certain kehillos will use a particular hechsher, while another equally frum kehilla will only use another one. and b. the reliability of that hechsher to ensure that its standards are being carried out on the scene.