Zoombucks vs Swagbucks

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I have been with Swagbucks many years and Zoombucks for a few years. I spend far more time on Swagbucks. For the longest time, I thought they were sister sites, owned by the same group, but more recently I read something that makes me think there is no relationship between the sites. Would anyone know? While I like Zoombucks, I like Swagbucks more and earn more on Swagbucks. Are other chatters on one or both sites and which one do you prefer?