Which is better? That probably depends on whether you ask an AJV or an AJX guy. At AJV you get 11 days off because you do more tiring back of the clock stuff. On top of the 11 days, many guys choose to take 2 of their vacation days per month to get a 17 on / 13 off roster. This is something scheduling is currently allowing, but it's not guaranteed that they will always do so. Additionally, there is quite a lot of flexibility in how you arrange your work and off time, (alternating, back to back etc.) The scheduler here works very hard to accommodate peoples' wishes, so most of the guys are able to get something they are reasonably happy with each month.