my parents divorced 11 yrs ago, i am almost 15 now and so far, ive grown up fairly normal, i lived with my mom for 10 yrs and visited my dad every other weekend for the most part, now i live with him and although its not entirely the same as visiting every other weekend its still great, i still have a fairly good relationship with my mom still although she was pissed when she heard that i wanted to move in with my dad but in the end she realized that if it wasnt right for me i would come back to her. now i go and visit her every other weekend, and my opinion is that for the kid's earlier years its better to live you with you, his mom. then when he gets older you should let him see if he wants to live with his dad or if he still wants to live with you.
as for the part about did either of my parents try and influence me? yes, my dad really doesnt like my mom much and my mom doesnt like my dad much although she's more civil about it. they both wanted me to live with them and they never talk to arrange when we're gonna meet so i can visit the other one, i am always the conduit and if one of them wants me to tell the other one something mean, i tell them they can do it themselves or dont do it because im not going to be mean, ive made my own decisions and i love them both.

i no he needs to make his own decisions, so talk to him and explain everything very plainly while trying to keep everything neutral, not hes bad and im good, but keep the kid even if at the time he gets mad at you at the time, in the end hell realize it was the best thing for him.