I'll be a nomad first, because of a comment I read on reddit. It said it's the most "immersive" experience for newcomers because through the nomads eyes you'll be ignorant to many things they are accustomed to, so you as a fresh entry into this game are perfect to this role to learn from the beginning, role play wise.

Cyberpunk 2077 is first and foremost a RPG and so, being someone who already knows much about this world, is (from my perspective) just not what is logical and I'll take the nomad route.