I don't own either type. I'm jumping in to say that there are some big breeds that are actually very low key and might make better apartment dogs than a high energy little dogs.
I forget what site, but you can look up the exercise that different breeds kind of need, and you'll be surprised at how low key Great Danes are. Now, of course, physically a Great Dane might take up half your apartment and it's possible that your apartment has a pet size limit.
I just didn't want you to think you needed a little yipper when maybe you could go big.
ETA:
http://petpeoplesplace.com/resources...y_exercise.htm
Actually the two breeds you are looking at look like excellent city/apartment dogs.