there is no best style every style has its pros and cons as a boxer you find out what style is best for you personally. its different for everyone
technical semi slick boxer to me. but people with natural punching power come to fight. people with natural speed, will most likely want to fight in a flashy in and out style. people with natural speed and power, will be the boxer punchers. they can box in and out, plus they have an athletic advantage in the speed and power department. some fighters with above average speed and power will sometimes have a perfect balance, or might even look ordinary to the guys who have it in abundance. but the balanced fighter want depend to much on his power and speed, or athleticism. he will be more focused on his craft and skill set i think.
Best style depends on what type of boxer you meet. You should be able to adapt to make it as hard as possible for him/her so you win the fight. But I love to fight in the flashy style
There is no best style, it reallly depends on who you are fighting. But generally I'd say it is the counter punchers because they are slick defensively andforce you to throw a high amount of punches.