While all the routes are unique and I love each one because they are all great, my personal favourite is the good path of Shoichi's route. I'm firmly in the Yuu-Sho shipping camp, and his route is the canon route in my head-canon. I guess that means I love the best friends to lovers trope, lol. My ranking of the routes on a scale of most favourite to least favourite is Shoichi (the good path of his route is the best in my opinion, and I'm looking forward to reading more), Haruki, Keisuke, and then Jun.