Cathie Wood of Ark Invest believes Tesla's cars are still very competitive, especially in metrics like range and power for a given price.She also stated that Chinese automaker BYD's cars are fabulous.BYD's revenue outpaced Tesla's in 2020 and it recently revealed chargers that are four times more powerful.Wood is confident in Tesla's ability to fend off rivals like BYD, especially considering the additional value from its work in autonomous driving.