This might be a bit too much stereotyping, but, in my warped little mind, the standard barbarian goes with the viking- or Conan-like barbarians, usually from colder climates, armed with axes, greatswords or hammers. The whirling frenzy variant, OTOH, is the plains-warrior type, swift and agile, using spear (or, perhaps, a quarterstaff) as his primary weapon, perhaps even double-wielding handaxes (sort of like Native Americans).
Also, if you're playing in FR, it might be appropriate for ghostwise halflings, who have barbarian as their favoured class.