6 psi is really not much of a difference. Neither one is going to get you in trouble. I'd try the higher simply because letting a little air out mid-ride is so easy. Then ride it. Seem a little too hard? Bleed a touch off and try it. (Do have a means of re-inflating in case you let to much out. A another reason I am such a fan of full frame pumps like the Zephal HPX. Sadly the means to mount them easily on modern bikes has gone the way of the dinosaurs.)