A ceramic grill would be ideal for your climate, MN.
IMHO, ceramic is ceramic.
We all have foreign goods. Does possession of one less import make you feel more patriotic?
A lifetime warrantee and a vast dealer network take priority over a grill's shape, or where it was made.
Lots of new ceramic grills in the game now. Look for one, like Weber, that has a reputation for eggcellent customer service. One that will be around when the others fall.
Most vessels used to cook on grills are round. Skillets, pizza stones, woks, dutch ovens, etc. Don't really see an advantage of an oval design, unless you frequently cook traditional BBQ items. Round has advantages. The Neopolitana you wish to attempt is one of them.
The close proximity of the round dome helps cook the pizza from all angles by convection/radiation.