He's recommending those because that what he has and wants to sell you. As long as the tires are the correct size, speed and load rating, anything not Chinese made should be good. Though you will generally pay more fore quality, hopefully.
Consider what type of driving you do. All Seasons tires suit many weather conditions (and people) Summer tires will grip better, cost more and make the car ride more harshly. The Michelins are great I'm sure though will be more $$$.