but 10 + 14 is good as well.
The X2 starts quiet early, so a 14 should be ok for the low end. But the 10 goes up to 7.5 Beaufort, the 12 up to 6.5-7 Bft.
Depending on your winds: if you have more lighter winds, go for 16+12, if you have more stronger winds get 10+14.
Welcome here and kite with the 10 m2 X2 in 7.5 bft, ie. 35 knots? Halleluja... I will buy you a beer for every knot above 25 knots you can make, stay in control and keep on jumping. Maybe if the air temp is 40 C, then you can make higher wind speed and but a 15 C not. Hot air is lighter and has less power than wet and cold north sea air. Believe me. For me, 9.5 m2 AR5 starts to be a handfull in 22-25 knots, and I think for you too...
yes, the Airblast starts later but can be hold longer than the Naish kites, due to a longer depower.
You can fly kites up to this windforces, but only in gusts. When I speak about maximum I mean gusts. Maybe I didn't specify this. Since we always have gusts here (more or less) I only can talk about maximum speeds in gusts. And so I know how far I can hold the kite. One day I was out on a ARX 11.5 with gusts up to upper 7 Bft. When the gusts came I couldn't really ride relaxed, but for jumping it was ok. To jump high you have to have power.
I had my X2 10 out in gusts up to 7 Bft and didn't use the adjuster, so yes, you can fly it up to 7.5 Bft.
But don't forget, I'm experienced and ride since two years. Off course a beginner can't do it and shouldn't get an X2, but an intermediate kite.
I rememberwhen I met Flash Austin last year.
I asked him which size he uses in what windforces. He said he is riding an ARX 15.5 in winds of about 25 knts (mid 6 Bft). I couldn't believe it!
But when you ride and are getting better each time, you can hold the kite longer and longer due to technique and experience.
Don't forget my weight is almost 90 kgs (180 lbs) so I can hold a kite longer than a 70 kg guy. But sometimes I see guys on the water with the same size as I use and I'm already powered up and their weight is 70 kgs and I'm wondering how he can hold it.
So don't say it is not possible to hold it up to these forces, it is, but not for beginners.
And a kite with a higher AR can be hold longer, because the areas to attack is smaller than smaller AR's, but the high AR is faster which can create more power specially for jumps.