I agree that both terms basically mean the same thing. But on a side note, 'Bikers' is a term used most often when referring to someone or a group of people in a club or gang. Where Motorcyclists is a general term that describes anyone that drives a motorcycle.

They both mean the same thing.

A biker can also be someone on a pedal bike (bicycle)

Yeah yulaik message me. I will help you with English