You are doing the right thing. Visit each club and decide which fits your goal best. And you are right that each club has individual character and clientele.
One thing to bear in mind tho, the same club may differ from meeting to meeting. Some nights more people are out, so one night's impression doesn't make a club.
One way to determine a club's talent and organization is (assuming it has been around) is how many people in this club have won area speech contests and advance competitions.
Enjoy your visit.