old style boxing vs new styles

my question is this, if you trained up to fight like the old ways rocky marciano style, do you think it would be an advantage, seeing as everyone trys to fight either standard style eg cotto, or philly styles boxers eg mayweather. pros, i think the old style fighter can generate more power, especially from the right hand since its cocked back more and comes from lower position. the use of switching stance becomes eaiser (walking oppents down litterally) and allows for more angles cons, now days fighters have neater organised footwork, making them hard to hit, and exellent jabs. the general speed advantage of modern fighters, moving more economically, orthough they may lack power they do land quicker and more accuratly.