What is the best rod action for braided lines?  (xfast, fast, medium, etc)

there is no best action for braid, it works well on almost 100% of rods

Yep can be used with any action. I have it on moderate, mod/fast, fast, exta fast rods

There's no such thing as "the best" of anything.  What I think is the best is different than what someone else thinks is the best.  Any rod action or power will work well with braid.

I only use braid.

The rod  depends on the application you are going to use. In some techniques you need some stretch to secure a hookset. For example, spinnerbaiting, and crankbaiting  quickly comes to mind. With braids zero stretch properties you will pull the hook out if you do not give the fish sufficient time to take the bait. The right rod will make up for braids zero stretch.

Medium fast

 

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What is the best rod action for braided lines? (xfast, fast, medium, etc)

What do you plan on throwing with the rod? As stated above, there is no single best answer, but knowing what you plan to use it for would be helpful.

lure and type of technique you are using mater more for the type and rod action you need, line type is a minimal consideration for determining action, in most cases the technique will determine the rod power and action.