SQ
It is only 4 across vs 8 across on United.
You sleep diagonally, the pitch is less relevant since the length of the sleeping surface is much longer than the pitch indicates. Your feet actually go into a cutout of the seat in front of you.
I am around 6 ft and also a bit on the heavy side. I find the UA seat too narrow, never had a problem with the length of the SQ seat. Also service on SQ is great and UA usually somewhere between mediocre and horrible.