A white or off white leather couch can look amazing if the rest of the décor is well thought out. If you purchase the couch and the design stops there you might be in trouble…so you are both right (how’s that for diplomatic?) A monochromatic pallet would look great with a white leather sectional, meaning go for different shades of whites/creams/browns in different intensities throughout the room. If you like a more modern look you could pair it with black accessories and maybe a punch of red. Again the key is to know the look you are going for before you purchase so that you don’t end up with something that doesn’t reflect your taste.