What’s the best picking movement?
Wrist movement?
Forearm movement?
They have different pros and cons, and they can blend with each other! You’ll probably get best results by trying several types if movements. In fact you can use different setups for different songs/passages. Whatever feels the easiest 
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The one you can do! Similar question to “what’s the best camera?” The answer is always, the one you have on you!
When it comes to picking motions, try them all, and immediately choose whichever is working best.
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