I agree with the consensus, and at 64 I'm old enough to have given this matter some thought.
One of the things that many people in my age group lament is that medical science has developed many ways to save heart patients, so that we're all much more likely to die of cancer.
Heart attacks used to be quick and final. There was no such thing as CPR. Sure, there is some pain, but the throngs of people who have survived them lately describe it more often as "serious discomfort." And life after a heart attack is a life of reduced quality. They can't reverse the underlying causes. They can replace some cardiac arteries (which is extremely unpleasant) but they can't totally prevent them from getting re-clogged with plaque. Heart patients spend the rest of their lives giving up things they love like rich foods, drugs and a TV-centric lifestyle, or they don't do that and they spend the rest of their lives wondering when they'll have another. Or both!
Many people go back in for heart surgery a second time, already knowing how awful recovery was the first time. Artificial hearts are even worse, they have to be replaced every ten years.
If you have a true "heart attack" that stops your heartbeat they can often revive you; even many laymen can perform CPR. But if your brain has been deprived of fresh oxygen for more than a large fraction of a minute, you may very well suffer a degradation of your cognitive abilities. Who among us intellectually-oriented members of SciForums would want that life?
If I have a heart attack they're not going to find me with my phone in my hand, frantically trying to call 911.
Cancer, on the other hand, is never a comfortable, merciful death, as many previous posts have attested. It rarely kills quickly. The shortest elapsed time between diagnosis and death that I've ever heard of from a surviving family member was three months. The last couple of weeks, as it metastasizes to other parts of the body, can be excruciating, and the state of the art in painkillers is often not up to the challenge.