CZ is more economical, yet just as reliable, accurate and rugged as the Glock. 15rd mags are plentiful and reasonably priced. For a home defense, plinking, and informal competiton pistol it's hard to beat. The Glock 19 has the edge in concealability and accessory/replacement parts availability at this time. Things like holsters, night sights and grips are available but only a select few companies offer them for the CZ at this time. For a dedicated concealment pistol the Glock 19 would be the better choice for that role. Either pistol would be a good choice for your first gun IMO (I own both), so go with what fits your hand the best. Rent both to see which one you shoot best and you feel will fill the role you intend to use it for.
Rick