I currently have all three. Weather XM is giving consistent rewards, although low. I really like Nubila. It dual mines B3TR. I bought one Nubila and then bought another and a node with the B3TR rebate. They started paying out the rebates for the purchases over 12 months. I’ve had the most trouble keeping SkyX online, but it is user error.
WeatherXM is going to win out, but thats not saying a whole lot at this point