People like what they like, and some folks like Joan Jett a LOT better than Heart. So, it's not about who you like to listen to more than the other. From an objective, musicianship standpoint there's really no comparison. Heart is leaps and bounds better at the musicianship aspect of things. Somebody earlier described Joan Jett as punk. I think that's close. She's thrash and punk and loud and fast and "in your face". That may be the style that excites you. That's great!! This is a little like comparing Yes and the Ramones.