If you're gonna go for freestyle tricks, the Kombat will be better. The Futuras have no central back strap option and hence will be more difficult to freestyle. For "general freeriding" both are very nice though.
If you're not gonna use bigger than 6.5, I think a Kombat 96 will work fine, but if you want some extra float, take the 105.
The Kombats are quite fast boards too.