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Please be less aggresive.
You are wrong, dervish dance does allow you to use DEX for attack rolls, remember that scimitars aren't "finnessable" weapons. So if you somehow get access to dervish dance while igoring prerequisites you will still be able to use DEX for attack roll and damage roll. Slashing grace on the other hand does neither allow you to use DEX for attack roll nor use the weapon finnesse for the weapon* you have selected for your feat.
*remember that there are only a couple finessable one handed slashing melee weapons that you can use with weapon finesse and iirc none of them are in the CRB.