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?
I only use it on defense missions where I don't have to run. And even then, half the time I forget to set it. I like the light armor best, specifically the Legionnaire Armor so I can yeet stratagems super far.