When you’re in an aisle seat you direct your own destiny. You get up to use the lavatory whenever you wish and don’t need to worry about waiting on other passengers to gather their belongings to let you out, or your seatmates falling asleep and needing to be woken to let you out. I find window seats claustrophobic.
It turns out that the preference for an aisle seat over a window seat also means you’re a better customer of an airline’s loyalty program, based on data.