I had been throwing Spikes but putter vs putter competitive rounds last fall, Spike vs. Pure vs. Sinus, convinced me to change. My putting style, or lack thereof, has me using a Grip Pure when playing competitive as the glide can help pansy putts get to the mark. When playing solo I use a Zero/Grip combo. A Sinus rounds out the P&A stable for everything else; winds, higher angle hyzers, short overhands, and the slo-mo short range turnover shots I love so much.
Then there's the purty factor. Red Grip Pure with holo foil and white Zero Pure with silver foil make for a mighty fine looking couple.
...there was a time when you were taught to find the best disc for you, not the best disc for your situation on the course, which is how they are sold now. IMO, the flight charts are basically there to point out all the stuff you dont have in your bag and why you suck.