There are two types of Tango, the English Tango and Argentine Tango. Although the English Tango is included in the Smooth division of competitive dancing, the Argentine Tango has taken over in popularity. You can find Argentine Tango clubs all over the US and once hooked, couples usually go to the source and soak up the "real deal" in Argentina.
There is a big difference in the dance hold. English Tango maintains the rigid English dance hold but the Argentine is a soft melting together of the couples. Many couples who dance Argentine seem to specialize in just that one dance, in much the same way that West Coast Swing was, years ago. I think I would prefer Argentine Tango but we never had much time to practice as we were always busy with the Ten-dance of the competitive ballroom.
A short video below of the Argentine Tango.