Difference between paddle and hook when mixing dough

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what is the difference between paddle and hook when using mixer for dough as I’ve noticed a lot of people use paddle when making ciabatta? Is paddle better for high hydration? Breaking down stiff biga? Thanks 

The dough hook won't grab the dough once it reaches a certain hydration level. It just mixes a small puddle at the bottom of the bowl. Sometimes it does better once the paddle has developed some amount of gluten.