On the Axis 760 cm Carbon mast complete set up you will get a weight saving of
apx 300 grams compared to a complete Ali set up. Not massive but you can definitely feel it when you pick up the 2 different rigs. The 300 gram saving includes the removal of the Ali mast / fuse insert.
Here is some carbon mast fun facts:- I still consider the Gofoil 29" mast the stiffest on the market BUT it's not tapered and has a much wider cord at the fuse 135mm and weighs apx same as the Axis 16mm Ali mast however the Gofoil is only 13mm thick, that's pretty good. Price $1,400 Aus but that includes the fuse so good value for a very good mast & fuse.
I rate the Starboard carbon mast as definitely one of the best on the market but they come with a price tag to match. However you can now pair the Axis right up against it . They basically are the same dimensions 110mm wide at the fuse , both an inch narrower at the fuse than the GF but slighlty thicker at 16mm . Price-wise:- Starboard apx $2,000 their windfoil mast are $3,000..... Axis 760cm $1,100 & 860 $1,165.
Stiffness wise yes Gofoil at top then closely followed Axis & Starboard ( Moses) which are much stiffer than the following:-( no order) Takuma , Cloud , Uni , Sig , Armstrong , Neil Pryde & Lift . The bottom of the list for stiffness I've used is the MFC but that was their original gear haven't tried any of the new stuff but again alot of high end proners liked that flex. This is just all my opinion some might not agree but it's just what I've found. Because of the differences in wing designs you really are never going to get a fair comparison to test which carbon mast is best. Re the stiffness it all comes down to where it flexes and torsional strength (twisting) so not all flex is bad and with different cores and carbon layups affects how the mast will react differently to load , that's what separates the brands not purely the flex test. The Armstrong for example has a hardwood core and may feel a touch more flex than others but behaves really well under your feet and feels good .
So which is best don't ask me..... and is the Axis worth the upgrade , for me definitely yes as a proner , wing ding not really , DW Sup paddler definetly and Sup surfing probably . Again all in my humble opinion.