there's a huge overlap in technique between steel-string fingerstyle and classical playing. I've certainly noticed an improvement in my technique and finger independence since taking up classical guitar study 5 years ago.
For me classical guitar requires good nails to get a good sound. I also play steel-string with nails but I've heard many players who don't and still get a great sound out of their instruments.
Classical method tends to be more strict and rigorous - probably why I find it so tricky - but does encourage good hand position and finger independence. In addition some of the classical repertoire is truly beautiful.
My suggestion: try both
