There is no "best" turbo or turbo kit. It depends on what you want. Smog legal? Maximum top end power? A fast spooling turbo? How much do you want to spend? A normal Drag kit is a good place to start, but the fuel management they use (FMU) isn't that great. You could piece together your own with better parts if you wanted. Most people just go ahead with a Greddy/Drag/Revhard kit.
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2015 Ford Mustang GT Fastback - Ingot Silver - 6M - Performance Package - Gibson Catback, JLT CAI, FR 47lb injectors, BAMA E85 tune, Eibach Sportline, BMR wheel hop kit, UPR oil separator, Steeda shifter bushing/bracket
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