I think you should focus your search on small, one sail boats that can be single-handed by a novice
. Not only are they less expensive to purchase
and maintain, and are economical and easy to store, but they provide beginning sailors with the simplified, solo experience that teaches them the principles of sailing in a relatively unchallenging vessel. They have a sheet in one hand and a tiller in the other and learn how what they do with one has a direct and usually immediate connection on what they should be doing with the other.
A Flying Scot is much too big a boat
for this purpose. I've been sailing one for 20 years and while they are great boats they are not a great choice for someone to learn on for the simple fact that they require experience to single
hand. For intermediate sailors, yes, for beginners, no.
If you're teaching kids
up to the age of 15 or so, then the Optimist is your first choice. For adults I would suggest the Laser Pico.