I really like both, but I find that it all depends on what I'm doing.
These days I rarely find the time to just sit down and
listen to some music without anything else going on (which is a shame), but it's perfectly fine just to have some going in the background while I'm doing something else.
I can only
watch movies. It really bugs me if I miss one line, let alone a whole section of a film. I can't really be doing something else at the same time. I've got to be totally immersed in the film or I'll just give up on it and lose interest.
Mind you, it does depend on what sort of film it is and who I'm watching it with too.
