Sig P229/239 or Glock for Concealed Carry

Living in the Philly area, I am looking to buy a gun for self defense and practice. I like the .40 caliber size for the magazine size/power balance... I'd also consider a .45. I definitely need something that will be comfortable concealable...

I love the Sig's style much better than the glock... However I like glocks new trigger safety system (it can only fire by using the trigger).

My question is... Do the Sig's have safety's? And what would happen if the hammer got caught on my shirt and then released... Would it fire?
I was at the gun range and rented a 9mm Sig and I asked the ranger where the safety was... He said that the safety is to not pull the trigger until you are ready to shoot.

So all in all I like the Sig styling much better... But I like the glock for the safety option. Can I have an experienced opinion on this?

Thanks.