Which Rear Brake Pad?

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mazda
My rear brake pads have 3mm - dealer told me - they say resurface the rotor.

I usually buy the parts at rockauto. I am puzzled that they have a large selection - Economy is not necessarily cheaper than Daily Driver!

I mostly drive interstate. M5 is already known to have long breaking distance.

Which pad should I get? or Pad/rotor combo?

Metallic vs ceramic - difference?
 
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