1350 posts
If you're big, 14+15 will suck. Crab like sailing, little lift, also tail slides will be hard to control. Depends on the surface area but still.
Depends on your style, your spot, do you need to point, or side off, do you need safety or looseness, etc. Steep wave, round waves, etc.
1350 posts
Unless going for top gps numbers, go for the best looking (to you) sail. Try a few different things during your first sessions, take notes.
Sometimes a sail will perform better with a mast from a different brand!
Forget anything less than 75% carbon and off you go.
Often times freeride sails are cc anyway across most manufacturers.