Even amongst Shotokan people, there can be a significant variance.
Of course, you have the "big three" organizations (SKIF, JKA, ISKF), along with other organizations that are going to be pretty similar with what they teach, with each faction having some small differences.
What styles of Karate pique your interest? Or, more precisely, what is it that you're seeking? There are many styles of Karate, and there will be a very wide variance of techniques amongst them.
For example, if you want Karate with more grappling / soft techniques, you may want to take a look at the classical Wado Ryu schools.