Question about farms

I'm from the UK, and I am currently trying out perk tv playing videos on a couple of my devices to earn points, but the points I earn in the UK is not much compared to people in the US. I was wondering which is the best service to make money out of these three: Perk TV (streaming videos), swagbucks (streaming videos) or checkpoints (streaming vids)?

I'm looking for the service that rewards the most in the UK

cheers