Learn to sail one
hull, then transfer that to two. Your title suggests a difference and there is.
The slice and carve of a
single hull through different bodies of
water is an acquired taste that once internalized, you will never satisfy (a truly wondrous thing). Once you develop a sense that you can master that skill while you refined your taste for piloting a
wind powered
boat (it's a wide menu), then decide.
Mono vs multi is a difference. You decide, but it's a lot less expensive in spending time refining your sense of it in a
single hull.
I was on the final approach for a cat but got a contemporary design mono hull that gives me an approximation of cat features but delivers on my appetite for directly feeling the ocean through the foils of my
boat. Is that what makes
dolphins such happy creatures? The extra hull dampens that feel, IMVHO.