I always aim to board first. Boarding last means you have to still wait for all the slow people blocking the isle, sorting their luggage into overhead storage, sorting their kids, etc… rather stressful. By getting to my seat first which is always the window seat, I avoid the hassle of asking people to stand up to let me in. I can also spread out to sort all my stuff for the flight, iPad, drinks, snacks, look at the inflight menu, etc. Once settled, I put my headphones on and start a movie on the iPad, oblivious to the other chaos around me! Less stressful.