I have used Schrodinger and AutoDock (& Vina) and found both are reliable. As schrodinger is a commercial license based tool while AutoDock (& Vina) are freely available. Schrodinger generates a bit amount of data that can be more useful in the study.
I haven't used Discovery Studio but as I read in literature that is also good.
Thank you for your comments. @ Prateek. I have tried with Autodock but some error following the manual and not clear, can you provide me a Autodock methodology please.
i use chimera for protein ligand, aoutodock embedded in vina. It is very useful and easy, moreover, it is free. But shrodinger is quite popular if you are considering buying it.