Best HEART SPECIALIST/DOCTOR

I have been referred to do some specialized heart tests(ECG,Stress treadmill etc)and to a heart specialists/cardiologist. i am wondering who is the best doctor in Vaughan. If anybody have any experience with any doctor who is best and any doctor I must avoid. Distance is not a problem although I prefer near Maple/major Mackenzie/ruderford road but a VERY GOOD AND PROFESSIONAL DOCTOR IS THE PRIORITY.