Puppy, does learning classical guitar also help with proficiency in other genres? Like for instance, Jazz? Or even metal?
Certainly the Guiliani 120 would be perfect on a tele or good for any guitar. The Brouwer 12 should work there too. But once you get to the latter numbers of the Sor 24 you'll likely run out of room to do all the work necessary. I wouldn't try the Villa Lobos 12 at all (though a few Etudes, like #1 do go well on an electric)
As to classical guitar helping with other kinds of playing. Well, yeah, it helps, just in the way playing different kinds of styles help expand your knowledge. Randi Rhodes was known to be a huge fan of the Villa Lobos 12 Etudes and used some of them as warm up pieces.
I will say though that there's a difference. As you can see, classical guitar is all about dissection and building ways in and out of positions. It's almost a scholarly pursuit. Whereas other styles, especially Jazz, are almost diametrically opposed (less dissection and more flowing). For these kinds I'd say look at what Glen was talking about shifting scales and all that. If you can do that you're better off than teaching yourself classical guitar to get better at Jazz guitar.
Classical guitar is about taking something someone else made, playing by their rules and making it your own. Jazz is about creating your own thing. Different paradigm. Requires different skills.