I normally use medium armor, and if I want to be extra fast I use light armor.
Don't get me wrong, I like the looks of chunkier armor, it is more my style.
But what is the use for heavy armor? I understand you are tougher to kill, but I am always left behind because it is slower.
Also I am still thrown around with explosions and I can't still be killed easily when overwhelmed, which I can avoid with medium or light armor by just healing constantly and running away.
So in what situations or what is the tactical advantage of heavy armor?
Or are you enjoying sampling all the thing you can do in life, and finding you have several things you like?