95%, if not more of anyone selling picks is simply trying to take your money. They are Marketing and Sales people. Most are just cash and soul sucking scum. If their picks were so great then bet their own money and make a living. And that is something not many people are able to do.
You can head to the Service Plays Forum and take a look and watch, ask some some questions. You can get bezobets there for free (I know nothing about them) and Leiner (who I would stay away from). Personally would not purchase any pick.
Good luck.