I like a lot of styles.
I like love textbook fighters with a great skill sets and jabs like Alexis Arguello, Harold Johnson, Carlos Monzon they're 3 of my 5 favourite fighters right there.
Then I also like defensive slick fighters like Floyd Mayweather, James Toney, George Benton etc who use there sholders to get out the way and can stand right infront of you and make you miss, on the inside and outside.
Then I also like aggressive fighters but with high skill levels and inside fighting like Dick Tiger, Roberto Duran, Castillo etc.
Then I also love a tear up
So I like a wide range but I'd say my favourite would be a text book style with great skills and jab.