I’m not sure about the best one but I can tell you what the worst free VPN is easily enough. That’s because I’ve had the displeasure of using it for quite a while. Ladies & gents, the worst PoS (piece of software) that was supposed to protect people’s privacy but deliberately failed to do so was Ontavo. Ontavo was a Facebook “VPN” app which in reality was used just to collect people’s data. I read that it tracked you even when it was turned off. I don’t really know what it collected on me but I deleted it as soon as I learned it was a scam. Sometime last year I guess they discontinued it so that’s good. Anyway, I think it will be back at some point, maybe under a different name. Just my advice to everybody: stay away from anything Facebook tries to get you to install!