Fool.com contributor Parkev Tatevosian compares Rivian (RIVN 6.10%), Tesla (TSLA -1.11%), and Nio (NIO 8.72%) across critical financial metrics, including their latest production numbers, to determine which is the best stock to buy now.

*Stock prices used were the afternoon prices of Oct. 9, 2023. The video was published on Oct. 11, 2023.