I checked a game of mine, organized would save me around 75 commerce, financial at the same time would give ~100-125 commerce (i didn't bother to count every single square)
This was with 3 low upkeep civics and 2 medium. Add in the courthouse/factory/lighthouse bonus and it catches up with financial. As i said.. underestimated.
This was late game, with infantry in the play and average city size 12-14 (1460 or something AD)
Don't get me wrong, financial is good, especially early on when cottaging a river square gives 3 commerce right off the bat. That coast squares is useful is of course good too. But the game isn't only about cash
The reason i prefer Organized leaders over Financial ones, is the cheap courthouses. You can whip courthouses immediately after end revolt and keep going forever almost. It's a bit harder doing that without Organized trait.
On a sidenote, i feel the best leaders for war is Hannibal and Napoleon cause of the awesome traits. Ragnar is close, but i feel Aggressive is weaker than Charismatic as it is now. (i wont comment on the Romans, Praets are too imba)