Does KSM-66 Ashwagandha actually do anything?

I'm looking for a good ashwagandha supplement to help me with anxiety (I'm often an anxious mess but don't want to get on any prescriptions). I'm wondering which form of ashwagandha everyone recommends.

I've been looking at both regular ashwagandha and KSM-66 ashwagandha. Which of these is best for my goal? Is KSM-66 ashwagandha just a gimmick?