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

im 106 kg, had both the 9.7 and still have the 10.2. The 9.7 is way too small, the 10.2 is the size i would recommend. I surf mainly the allwave 9.6 at the moment, but still hop on the 10.2 psh every now and then, great board, easy to get vertical, but a little tippier and a lot heavier than the allwave or mana.