Campaign TTRPGs need more than a good first session; they need characters, places, threats, and procedures that can change over repeated play. Start with Ars Magica, Champions, Cortex Prime, and Pathfinder 2e as comparison points, then move down the list based on the kind of mechanical focus your group actually wants.
When comparing campaign games, look at advancement, faction or relationship pressure, downtime, campaign scaffolding, scenario support, and how the game creates fresh decisions after the premise is familiar. Those details matter more than the tag itself, because two games can share a category while asking completely different things from the GM and players.
Use the top picks as anchors rather than treating the page like a simple popularity ranking. The goal is to answer the practical table question: which game will produce the kind of first session, campaign rhythm, and player buy-in your group is likely to enjoy?
A game with long books is not automatically a strong campaign game if it lacks tools for escalation and consequence.