S26 Naish Masts.
Ok, I will do my best to make this clear, but in reality, they're all awesome!

S26 Alloy. These masts are super light. They have a longer profile which results in a little more high speed drag. For the money this mast is incredibly stiff and responsive.
C35 Composite. I love this mast and have been riding this mostly (yes, even after riding the C100). Whilst it is a little heavier than the Alloy and the C100, it has a really nice feel to it. I love it for carving and have also clocked Winging speeds over 40kmh on it. There is more than enough stiffness in this mast IMHO for anyone. It has far exceeded my expectations from the design brief and for the money, you can't really beat it. I ride this mast in a 75cm and an 85cm. Absolute weapons.
C100 Full Carbon. This mast is all the goodness of the C35 but about 200+ grams lighter. The difference in stiffness it tricky to describe, but it is there. For nearly twice the coin as the C35 it is hard to justify, but this is the case with all full Carbon masts when there is an excellent cheaper option. This all said the tightness and speed to response on the C100 is exceptional. I have always said that Carbon generally is not as stiff as our Alloy options, but the new S26 C100 is definitely the closest yet if not equal! Plus it does have a slightly better torsional stiffness.
So from my experience and preference, here's what I strongly think. Majority of people should just go straight for the C35, from learner to shredder. The Alloy is an awesome mast, but for the $50 in package or the $100 individually, it is money well spent for an exceptionally performing mast. If you are always riding at super fast speeds and pushing the boundaries, or if you have the coin and wish to get your kit lighter, then the C100 is the option. I have gone back and forth from the C35 and the C100 and still have been riding the C35 as my goto mast (there's just something really comfortable about it - maybe the $700 saved

). But really which ever mast you go for in S26, you are going to be stoked for sure.
In support of all of this, we (Windgenuity) have backed the C35 mast as the STD for all our complete foils. It really is an awesome mast. More stock is on its way as we speak. Speak with your local Naish Dealer for more info now and get orders in. Shipment are still playing havok with getting stock at the moment and whilst supply is on the way, it is limited.
Ride safe,
JB