Go to one of Steve Cotter's IKFF certs...it's one of the few places where both styles are taught and put in their proper context.
Anyone can learn how to tense up during exercise, that's actually a pretty natural/instinctual response. Learning how to relax/contract/relax in quick succession is what (I've heard) separates the average athlete from the great ones.
Learning fluid style first makes hard style easy to learn. Learning hard style first makes fluid style difficult to learn. IMHO...I've taken both the RKC and IKFF certs.