If we based things in all the videos and experience we've had the best position is the women on her back with legs in the air as u can give maximum pressure to the g spot to get her to cum, hope this helps
any position you do as long as she is relaxed and comfortable and you take your time to give her pleasure . YOU must aim to give pleasure and forget the recieving your pleasure will come as she squirms around and squirt all over your balls
I don't know about others but for me missionary definitely... especialy with the legs pushed back... so you can really go deep and own this pussy I'm just saying xXx