The 27 shots she's referring to is the 10 and 17 round mags that come with the SR9c. She's saying that with the trigger difference between the 2 pistols it would almost be quicker to fire both magazines than all shots on the SP101.
I don't own any large caliber revolvers but I do have the SR9c and it's a very good choice for a CCW. Recoil is very easy to handle. The 10 round mag with the extension makes it small enough to conceal easily but large enough for a normal sized hand to hold onto comfortably. With a good holster it will sit nicely at your side and no one will ever notice it.