OK, as a JKD guy... I've got to tell you to stay strong side in front. Sparring, I feel it works best because the power is in front and has a shorter distance to travel. Also more distance increases power, so having your weakside back gives it more distance to travel and more power. As far as grappling, I switch to orthadox. I also have a background in boxing so I'm used to orthadox, and when there's no striking involved I prefer this stance to set up my takedowns.