How good is a cardiac mri with iv contrast to see any blocked or clogged arteries ? is it the best non invasive test? or is a stress test better?

Very good: so good that 90% of middle aged or older people will have something, but over 90% of them will NOT get a heart attack that year at least. In the very very small number of people who were negative at middle age. ONE had some heart trouble in one year, if I remember the study. Making it not all that great a test. BUT if negative age under 30, ekg normal, the odds of heart are 1/million