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I own a VP9 and love it, just wanted you to know people are not exaggerating about the cost and scarcity of mags. A VP9 mag cost about the same as a striped AR15 lower and more than preban G17 mag.
Well the obvious plug for Glock is the availability of preban standard capacity magazines. There are also more accessories, sights, holsters, etc. for Glock pistols than any other pistol available (save perhaps the 1911).
This is akin to comparing an AK vs AR: The Glock is reliable as a result of loose tolerances, doesn't need much cleaning, and is combat accurate. The VP9 has tighter tolerances, is slightly more accurate, and is a bit more of a pain to clean.
The Glock grip is much different than any other pistol so as with any purchase, I would strongly suggest shooting them both and making the decision based on personal experience.