For me it's how long I've been doing it. If I've just started both are probably going to be good results. If I'm 4 hours in the music one will probably do bett

For me it's how long I've been doing it. If I've just started both are probably going to be good results. If I'm 4 hours in the music one will probably do better because I've not wandered away from my desk distracted by a shiny pen.