Vietnam Visa U.S. Citizen August 2016 Stamping Fee Increase

Greg and I are setting off to our next adventure in less than 2 months - to Southeast Asia!  Should we get a full visa stamp or visa on arrival?  Read about how we resolved the dilemma here (on our Asia blog):
 http://folsom5asia.blogspot.com/2016/09/vietnam-visa-us-citizen-august-2016.html