It really depends on what you like best and how much room you have. You can go with a pair of square ottomans for tight squeezes, select a wider cocktail ottoman if you have lots of room, or choose a longer leather bench seat; they're usually narrower and adaptable to any size space.
Before you buy, note the depth measurement of your leather ottoman or leather bench seat, and make sure that you have enough room at the end of your bed for the furniture plus 18″ or so—enough space for 1) walking past and 2) having legroom when you’re seated.