no shyte skis won't make you better at rails, but some skis will get f*cked up way faster on rails. I've heard from a bunch of people now that TMs break easy on rails, but I don't ride them personally. I have seen the Chronics, and they seem pretty diesel on rails. When Justin Gillern hit the mt. snow deck jib, they were pretty much fine at the end of the day: after taking out pine trees, cheese grater stairs, and a wooden deck.
Bottom line, I'd say people posting they're experience with their skis isn't bad at all. I have skogen's personally, and they've lasted pretty well for 2 seasons, but have finally died (not due to rails though)