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I don’t think there is one. Just what you like personally. When I started TAC about 3yrs ago, I had never played with a pick. I had only strummed with my hand and finger picked the guitar, so I ended up buying a variety pack of picks to try them out. It was very frustrating using a pick at first. I kept dropping the picks and they would turn in my hand and I would hit the wrong strings a lot. I kept switching picks all the time. But I stuck with it and got better. Now I enjoy using a pick. I’ve pretty much narrowed it down to 3 different picks I like to use most of the time. The longer I have been using a pick the more I find I don’t need to use as soft a pick for strumming, and a thicker pick is easier if I’m picking a lot of individual strings. I also found that different brands of picks can have the same mm but don’t feel the same softness or stiffness as other brands. That is even true within the same brand but is a different style of pick within the brand. Hopefully others will chime in as well. I’m curious if they always use the same pick mm.
Hope that helps. Kim