TexasCHLforum.com

As I mentioned earlier the 30 is the way to go. You'll have mag compatability. Plus it's not that much wider than a 26 or 27. Just put some Trijicons or Big Dots on it and you'll be good to go.

Another note is that ease of carry, reliability, and accuracy are all important. (listed in no order) But, magazine capacity is also important. If involved in a situation you are going to have reduced gross and fine motor skills. The less you have to manipulate your sidearm the better. It also means you can stay in the fight longer. Unfortunately in this day and age it is more likely that there are going to be at least 2 people involved beside you. Combine that with adrenaline dump and the fact that they and you are going to be moving means the probability of less hits. In addition handgun rounds are not the best stoppers in the world. Even if all rounds connect you are still going to use at least 2-3 rounds per person. It's not the movies where one round and they're down.
I know up here because of the economy robberies and burglaries are on the rise. I read the news and the police reports and in each case there are 2 to 4 subjects involved. Now we all pray and hope we never encounter these situations but if we do there is no reason to handicap ourselves when there are options out there to give us an edge to get to safety.
With the holster I mentioned in my earlier post I find I can wear my G30 for 10-12 hours with no discomfort. In fact it's so comfortable I forget I'm wearing it.

I'm a skinny guy and I have no problem concealing my G30. I use the 10 round mag in the pistol and I carry the G21 mags as reloads. I like how light it is and how easy it is to conceal. I use an AKJ Concealco holster. This holster really sucks the pistol into you. Go to http://www.greatholsters.com" onclick="window.open(this.href);return false; I find the G30 is lighter and easier to conceal than the Springfield XD 45 Compact. The XD tends to weigh on you after a while. It's 6 ounces heavier than the 30. It doesn't sound like much but after wearing it all day you tend to notice.
I'd say go with the 30, it's still easily concealable and carries more rounds and allows you to use you G21 mags.