There isn't really a "Best" weapon, it's basically just whether you wanna do 1Hand + Shield or 2hander. 2 handers are slower and do more damage, 1 handers are faster, do less damage, can be dual wielded for lots of damage, and can be used with a shield. Your choice, I use sword and shield for my Nord Thu'um Master, and my orc uses a Big ol' Axe.
If you've already chosen Nord, they start with a +10 for 2-handed skill. They also have a boost for light armor as well. I've been enjoying dual-wiedling a sword and a mace.
It depends on your playstyle, especially with the armor selection. Choose either heavy or light, and wear whatever the best is that you have available.