For gaming and music listening, no speaker can come close to a 5.1 headphone, because these activities require immersion and cutting-off of the environmental noise really helps.
But the situation changes dramatically in favour of speakers when it comes to watching movies, because Movies demand booming bass effect.
Another point to consider is that you cannot work for long with a hefty headphone on our head. A high quality one may be significantly lighter, but the discomfort in pronlonged uses will still be there.
Consider these points b4 deciding.