Is there any one good test that helps identify heart problems,I mean i know there are so many different tests out there but to everyone with a heart problem whitch test was the defining one for you?

Is there any one good test that helps identify heart problems,I mean i know there are so many different tests out there but to everyone with a heart problem whitch test was the defining one for you?
It depends on what type of heart problem you have:

Arrythmias are best diagnosed with EKG
Valvular disease best diagnosed with echocardiogram
Ischemic burden of the heart - best diagnosed with a stress test
Degree of blockage of arteries - best diagnosed with an arteriogram