Had some time to kill and was looking at the 3 cities deciding which i would choose.
Ul'dah seems like a compact very fast paced wealthy city that might be very populated and busy.
I would like this but i often spend my time in quieter areas plus this city is near some desert which might be good for gaining points but still not another Bastok.
Limsa Lominsa is a spectacular series of elevated islands over the sea and seems to be a city of great production.
This one looks great with a pirate feel to it and you have big wooden ships beneath.
Gridania looks like my choice. Full of energy and magic surrounded by rich nature.
Peaceful but not dull, its looks great located between the other 2 cities.
This of course is all speculation from the pictures shown at SE's site.