He he...

I prefer.... BOTH!

In Canadian Airlines 767 Business class, the A seat (left side) is a single, so you get both a window and an aisle. You also get a "glove box" that's about 12" wide on the right side of your seat, to put stuff in. This also means the aisle, and people carrying on television sets and the like are 12" further away from you. No more bruised heads.

You also get 65" of seat pitch. Not bad, for domestic business class.