Well,
personally, I would go the speeed. I never did particularly like the 10' Style... (But I still have it if you want to buy it, it is fantastic!

) For me, the speed gave me the stability and down-the-line speed to have fun on those small, clean days. Those straight rails worked wonders. I sometimes make attempts to get up towards the nose - but I am yet to make it with toes-over...
I am not sure what it was about the Style... It was heavier and I didn't like its inertia - it took much more oompf to get it going, and you had to jump on the tail to turn it around before the wave, otherwise it was like turning the QE-II. But when I did get it going, I just was not in love with the flat deck (i.e. not much rocker). I am sure it does not have rocker for a reason, and if I was keen on nose riding I would appreciate its qualities. But I am not so I don't...
FWIW I have the 8'10 speed (and an 8'8 speed I rarely use) and am 93 kg.
I hope that helps.