I concur with reference! Blastoise: https://unite-db.com/pokemon/blastoise/ Ninetails: https://unite-db.com/pokemon/ninetales/

When comparing just 2 hits of their base moves Squirtle does at minimum 167 more Base Damage than Ninetails at lvl 4 without considering items. But when considering Squirtle has almost double the Sp.D at lvl 4 and the fact that Blastoise only becomes more and more tankier as he evolves and levels compared to Ninetails...

The difference seems dramatic considering Ninetails should have roughly "double" the offensive power when comparing the star stat ranks. A "weaker" early game is a solid tradeoff for late game power, and obviously cooldowns are a factor to dps, but the damage distribution looks extremely off since rapid spin (resets the cooldown) affectively doubles the damage of Moveslot 1 and provides AOE basic attacks while unstoppable plus the bonus CC and Mobility already mentioned is a lot.