Like waltz, there are a lot of styles of Tango.
Argentine Tango, the original one, is in my opinion the most difficult partner dance there is, and I no longer offer it.
Ballroom Tango is not really any more difficult than Foxtrot, and for sheer drama can’t be beat.
There is more than one rhythm in Tango, but the basic one is: slow, slow, quick, quick, slow. The most common alternate rhythm is slow, slow, quick, quick, slow, quick, quick, slow, quick, slow.
It is the only Ballroom dance that doesn’t change weight on the closing step. The last three counts of most of the steps, known as a Tan-go-close, involve a step (quick) followed by a side close (quick slow) but the slow closing step is a slow draw with no weight change. Every new step begins with the same foot. The music is in two/four time which gives it it’s driving dramatic beat.
There are fewer opportunities to dance Tango even though it’s one of the most fun dances. You can’t dance Ballroom Tango at a Milonga (a Tango dance party) because the music for Argentine Tango is different. Argentine Tangos have an inconsistent beat, speeding up and slowing down, changing moods and rhythms, because Argentine Tangeros change the cadence of the steps as the music inspires them.
Ballroom Tango patterns each have their own set cadence. You do them the same way every time. Like most of the other Ballroom dances, you have to learn several other dances in order to dance Tango, unless you want to spend most of the evening waiting for a Tango to be played. But then, variety is part of the fun of Ballroom dancing.