I don't own Leafstorm, but I have handled one briefly. I do own both versions of the Sage.
As a collectible, the Leafstorm is the obvious choice. Historically, Spyderco's collaboration models have appreciated in value more consistently, if not always more dramatically, than their in house designs.
For a user, it's a tougher choice. Both knives are well built, arguably overbuilt for their respective sizes. Both use the same steel. So it comes down to tastes and preferences. Do you favor a a half ti/ half G-10 or one with an all titanium one? Which suits your needs better, a 2.5" saber ground blade or a 3" full flat ground one? Are you looking for a small, 2.5 oz. gentleman's folder or a somewhat more robust 3.5 oz. one. Do you favor a flat steel or wire clip? Do you require a lanyard hole, or can you live without it? Is a knife which you have to remember how to grip and close acceptable, or do you prefer one which will not bite you unless you do something incredibly dumb? Does it matter to you where a knife is made, or is fit and finish more important?
Personally, aside from the "prestige" of it being a collaboration with Kevin Wilkins, there is nothing about the Leafstorm I find appealing. I find the translucent G-10 extremely unappealing, prefer a full flat ground blade and, while I'm generally careful with my knives, prefer to use one which will not penalize me if I use it while preoccupied. So, even if I was right handed I would not own one. On the other hand, I was impressed enough with both the build quality and the ergonomics of the Sage when I got to handle one that I purchased both the CF and titanium versions, despite their being "wrong handed". I would definitely carry one of them, probably the CF, occasionally if it had a left handed lock or I suddenly woke up right handed.
Paul
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