Turbanned or not, I would prefer the typical svelte diminutive neighbour typical of SQ to the montrously overweight neighbour spilling over the armrests such as one encounters occasionally on UA.

If you are *G you can call SQ to allocate you a window or aisle seat, though they won't tell you the seat-number till check-in This can be a problem, once they gave me a window seat with only one armrest, squeezed in at the narrow end of the plane where other airlines don't put 3 seats in the row.