Rio 2010 S of M ?

[robert]

Hello there,

Last year my children, age 15-16 and app. 60 kgs, did some windsurfing on my board Futura 144. Just learning, they did well but problems with steering upwind. So now I want to buy a bigger board for the children, a Rio 2010 sport. Problem is I don't know to choose the S (175 liters) of M (195 liters). I think the S will do best, looks more a freerider at the end. Has anyone experience with the Rio 2010 S of M ? After 2 of 3 years of windsurfing the children will still like this board ? Which is faster, the S of M version, when surfing at 4 Bft ?

Thanks for reply.
Greetings,
Robert.