I'm 6'4'' 17,5 stones. I HATE faffing about in a tent with my spine folded in half, fighting the mud, cooker, rain, snow inside, boots. Oh, don't even get me started on changing clothes in a cramped, humid, cluttered tent. And pray to god you don't roll of the mat on the bumpy/cold/wet ground.
For me sleeping under a tarp is an upgrade to a tent, sleeping in the hammock is an upgrade to sleeping only under a tarp.
In the summer you can get away with almost no preparation, just like with the tent.
In the winter you have to do things right, just like with the tent.
I'm 6'8 and 18 stone and nothing comes close to the comfort and warmth of the hammock set up I have now unless I'm camping with the mrs on a futon with the woodburner having arrived by truck. First few times i used my camping mat beneath me, then I borrowed mates snugpack underquilt, and now have one of matts. It packs down smaller than a mat and keeps you toastie warm. I probably spent around a month in it over the last 12 months between laning and scouting and have had the temp down to -7. Key though with whichever UQ you go for is getting it to fit snug without being compressed. Also wear the hood off an old alpkit down jacket and that helps too on the cold nights too. But underquilt all the way for warmth and hammock for comfort.
ATB
Rich