Glock 17 or Glock 19?

I've been doing some looking and have decided I am going to purchase a Glock for my first handgun. It will be used as often as I can at the range and for home defense. I would like to purchase the 17, I would probably conceal carry as well. The 19 would probably be best if I decided to CCW. If I bought the 19 would I be losing much from the 17 version? Do any of you conceal a 17? Is uncomfortable?