@Nick ******
also , the VOA is a full page in your passport , e visa a small sticker I would highly recommend the e visa , as it saves heaps of time lining up when you arrive. Depending on the time of the day there can be 50 people lining up for visa on arrival. But e visa has 1 or 2 dedicated lines in Vientiane it’s pretty quick ( we’ll worth the 12$)