I had a Shield in 9mm but I just couldn't shoot it well. Sold it off and got a PPS (gen1 not 2). Before buying it, I read somewhere that the PPS " shoots like a bigger gun." I couldn't agree more. Love the way it shoots. Even in rapid fire it stays where I put it. I like the grip on the new M2 PPS but it looses the ambi mag release and squared trigger guard that I like so much.
Bottom line, guns are a personal preference. Most folks would be likely be happy with either.

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Dave