Poverty board is better than the lvl 1 boards, losing money is actually an advantage because its very rare for you to be short on it and when your opponent rat faces you they get less. Rich board is lower or equal to lvl 3 balance for the opposite reason.

Boards themselves depend on the character, the trick and balance boards are a little better then the speed boards unless your playing Nancy, Wendy or Coach where the lower jump is a big advantage.

Charm is better than Star. Ghost immunity is ridiculously overpowered. If there was tournament play this would be beyond a doubt banned, Star Board would be too but Charm is still far superior.

Ninja is low tier at best, and I'd rank it equal to the featherboard if not lower, the speed loss is a gigantic disadvantage. Racing Linda on Starlight highway should only serve to emphasis how useless the Ninja board is in a race. It's only useful vs Damien robot, that's it.

My list

God tier 1: Dragon board, High tech board

God tier 2: Charm board

Top tier: Star board

High tier: Rich board, Balance 3, trick 3

Mid tier: speed 3, speed 2 (not much difference), balance 2, trick 2, poverty

low: speed 1, balance 1, trick 1, featherboard

bottom: ice, ninja