I follow the recommended order, but if there is none, I usually start with the one I am least interested in and then go uphill. If I start with the one that I liked the most I'd probably loose all the motivation to read the other routes.
I always stick to the route order. I'm kind of a perfectionist, so I have to read every route even if I'm not really into the LIs. That's why it takes me at least six months to finish a lot of games .
I always check for the recommended order and stick to that. If there isnt one, I would say that I usually like to leave the route/LI Im most interested in for last. Always end on a high note