Greddy. It will spool faster, and if you only want to boost 7-10 lbs you'll be fine with the smaller turbo. Not to mention the quality of the Greddy kit is much higher than drag/revhard; it comes with everything, every nut and bolt that you need to get running.
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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
Team B.O.B.® - Ballaz on a Budget