Hi freedomtrail, I have demo 'd both sizes the 10'2 is alot better in surf imo
10'10 is a lot of board .I also used the 9'7 i think this is the smaller size dimensions this one surfed good and paddled excellent on flat water didnt try this size in chop i weigh 82-85kg so maybe for you 10'2 would be good allrounder.
I went for a 10' mana and am ready to get something smaller to throw around in the surf .This is a great sport for me when no wind to kitesurf pull out the sup and have some fun .go demo and enjoy .calbs