If I am correct TG only has the 2 seating on 747s not the 3 as before
The best is the 744 (10 seats with 6 single window seats),
the other is the 'old' 747 with 14 seats in 6 pairs along the windows
and the last pair in the middle.
Both offer full flat and are both very comfortable.^
They used to have an even older version with 18 seats in 9 pairs
(not flat) 8 pairs along the windows and one in the middle.
C is another story, as for Y........
