Which revenue do you susscribe to? Watching a site with ads or paying for a subscription?

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In music, in watching tv, or anything else...eg. do you prefer buying songs on iTunes, or listening to a service that has ads? For me, it varies. If I am in the mood, I will listen to a service with ads. If not, I will buy songs on iTunes. Maybe i should have made a poll for this, but i couldn't find that in this section.