When it comes to vessels, whether you utilize your spirit or a physical vessel, it is going to be a matter of preference. A binding is not more powerful, or stronger, whether you opt to have it bound to your spirit or a physical vessel that you wear or hold.
The most important thing when it comes to spirits is interacting with them and engaging with them, welcoming them into your home, and helping them become part of your journey. The most important thing with magick & spells is working with them and allowing them be be incorporated into your life.
No matter if you choose to use a Master Vessel, different physical vessels, or bind to your spirit, they will work for you the same =)