If early paning is your first priority and you do not use smaller sails than 6.5 I think 133 might be the one for you. This is a light-wind-board and spot on if you want top perfomance in light winds and still can go out in a little more wind.
Apparently the 122 will be more lively and a board to grow with so I`d say if you are a young guy this is the board for you.
If you, however are a veteran looking for a board to cruise around with in nice warm summerdays and not in need for a thrill, - 133!
Earlier planing, better pointing against the wind and better subplaning. (You can go everywhere on the lake)
- just my two cents