broly is the legendary super saiyan because he had a power level of 10,00 and could go super sayain quickly and he was a myth
goku(kakarot) is the legend of a super saiyan which is basically turning super saiyan and was told because of his father bardock went super saiyan against chilled, chilled then told his men to tell his relatives to watch out for the breed of man with tails and glowing yellow hair wich made him the legend
there is a difference in the both if anyone asks
legendary-sper strong for a super saiyan and was probably a myth
the legend of a super saiyan-when a saiyan becomes more powerful than he should be
at the time saiyans thought that broly was a super saiyan because of his power level as a baby but they didnt know about the transformation as no one had ever done it before bardock or goku too bad they werent there to see a real super saiyan