My favourite is Konoha. The will of fire is a tremendous power that all shinobi of the Hidden Leaf Village possess if they are loyal. Those who truly understand what is most important: the protection of the next generation of shinobi will do great things and die with honour.
What's more, their culture is pleasant and friendly and while they'e had their share of atrocities in the Shinobi Wars, they have a strong sense of honour and duty. I would visit Ichiraku Ramen if I could so I could try a bowl for myself.
They also have several useful clans. The Inuzuka clan with their ninken and great sense of smell, the Nara clan has their own land for grazing deer and their skills in shadow manipulation and their ally clans, the Akimichi and the Yamanaka clans. Konoha also has the Hyuuga clan, possessors of the Byakugan, which is apparently the best visual dojutsu out there which is why it is so coveted.
I could go on, but I'll let others participate in this topic.