Re: Learning on a cat?
In my early teens I learned in an Optomist Pram, and then had a 16' monohull sloop, and about then Hobies were coming out, and I got one as soon as I could.
If you have the option of going that route, the learning would be smoother, I think.
Hobies are "weird" as far as sailing goes-don't get me wrong-I love them!
But since they are SO fast, they don't follow the usual sailing rules as monohulls do-for example, when going fast downwind, you don't let the sails out, ("ease the sheets"), you basically keep the sails "sheeted in" fairly tight, and the boat's going so fast it's making it's own wind, (as a ski boat would), so even going with the wind the boat feels as if it's not.
And tacking a monohull is a challenge-it's done all the time, but it's harder on a catamaran.
TMI, probably, sorry.
But if you're looking to buy one boat to learn on, and then have fun sailing it for a while, I'd go with the Hobie and read a lot about sailing them. There used to be a set of two manuals that was mostly about racing, but really taught me a lot.