2 shields or 1 combined

Guys which one is better for arduino rookie like me.
A) https://www.sparkfun.com/products/9607
GPS Shield Retail Kit - RTL-12855 - SparkFun Electronics
B) http://www.robotshop.com/en/gps-gprs-gsm-arduino-shield.html
Functions are usual: take location coordinates and send it with SMS.
And is there any problem if i choose A) ( with pins or something).

With just one shield you know there's going to be no pin clashes.