Tribals should have little idea of how intrigue and politics work on a city-wide scale, I'd say, at least from an initial idea. Maybe they don't know that you're supposed to bow to nobility. Maybe they don't care about who exactly is wearing what rings or what silks. Perhaps lying comes naturally, or perhaps it's forbidden in their culture.
The lovely thing about tribals is that there are supposed to be dozens of extremely small tribes out there that are tucked away in their little own cultures of people, likely in extreme circumstances and places, that adopt their own sets of values. Perhaps everyone in the culture wears full body robes and cloaks, with veils covering their faces. Perhaps they wear absolutely nothing. Perhaps the tribals were well educated in certain things, and poorly educated in others. You could have a warrior tribe that spit on wounds to cure them, a merchant tribe that doesn't see the value in coins and only barters, a scholar tribe that doesn't speak a word of sirihish.
City-folk are easier to play in the short-term because you just know how the city is. Allanak is Allanak, they are brutal, in your face, and full of gallows humor due to the oppressive and overtly violent government. Tuluk is vicious, subtle, and full of self-imposed self refinement from living near a forest of basically alien monsters that want to devour the people living within.
Luirs and Red Storm, as smaller settlements, are probably the next best thing, considering they're sort of 'freelance' and have mostly player-run ideas of what is right and wrong, but still fall on the same basis of their closest counterparts with a twist, usually in terms of magick, spice, crime and justice, ect.
Coming back to my original point, tribalism allows you to subvert any expectations, or none of these expectations based on the tribe your character is a part of. Maybe your tribe spends all of it's time in Luirs anway, and you're well connected enough to know all of this. But there are still nuances that separate your character, as part of a tribe, to the cities ideals that should make them ultimately unique.