double stroller advice please!

K • Mommy to a beautiful baby boy ❤️. Baby girl arriving April 2017❤️
Ok, for those of you who have kids that are close in age do you have a double stroller? Which one would your recommend?  I need something that can attach to car seats as we travel often. Also I live in the city so something compact would be nice. My kids will be 18 months apart.  TIA