Any suggestions on which is the best at home drug test kit ?

All the same: They essentially use the same technologies, and differ on how many tests are available for how much. Some are only for a single drug (like Cocaine or thc), others are 5 or 7 or even 10-12 drug panels, and the expense generally goes up as the number of tests does. I would look at directions and see which may be easier for you to use, and otherwise go by price.