Another thing you're probably not aware of is that in '14 and newer 'Wings and F6B's the transmission was internally upgraded with different 4th and 5th gears.
The dog engagement was changed, as well as the gears are now made of harder steel.
If it was my coin, I'd go with a carryover '15.
That way you wouldn't have to worry about tire degradation, hydraulic fluid contamination, a fully discharged battery, and anything else.
And you'd have cruise and the upgraded trans.
And don't forget to make sure they've done the brake recall on any model year you buy.
2013 F6B, black, with ABS
If it ain't broke, try to fix it anyways