Most exciting = Sugar ray leonard/Aaron pryor
Most vicious = Mike Tyson, Roberto duran
Most methodical/efficient = felix trinidad, julio ceasar chavez
A good combination of exciting, vicious and efficient = Tommy hearns, Salvador sanchez, Roy jones, Alexis arguello, Oscar de la hoya, pacquaio.
*only speaking of fighters that I grew up watching.
Who am I missing? ...give me some good youtube material :)