Which is best for travel - NX1000 or Panasonic Lumix GX1?

Greetings.  Costco has a screaming deal on the NX1000 - $599 and it includes the 20-55 and 50-200 mm kit lenses.  The GX1 is also on sale for $799.  Besides price, which camera do you recommend?

I have lots of SD memory and the NX1000 uses micro SD (but that is a not a deal breaker).

I don't understand the difference between the APS-C sensor versus the micro four thirds.  Also, would love to be able to use my Canon EF-S lenses on my new camera.

We will spend three months in Kosovo (hubby is working) and I get to take lots of street, landscape and touristy pictures.

I really appreciate your help helping me chose between these two camera.  Thank you.