Heart attack is a VERY loose definition of a pain in the chest, any pain in the chest is a result of damaging loss of circulation to any part of the heart muscle. If anyone has a stent or bypass after a symptomatic experience, that person has had a heart attack by definition, it is really that simple.
Now weakness or other symptoms not involving pain such as arrhythmias, congestive failure, conduction defects, or pacemaker insertions are indeed cardiac events but they are NOT heart attacks.
Which is more dangerous? Hard to say, none of the above are really good things.