Which claims adjuster license is the best to have?

If your home state licenses adjusters, that license is the place to start, because other states generally issue reciprocal licenses to holders of an active home-state license. If you live in a state that does not license adjusters, Florida and Texas offer designated home state licenses that most licensing states accept by application and fee alone. California, Hawaii, and New York do not reciprocate, so they require their own education and exam.