To come back to the original question it really depends if you believe Elon or not. If you believe Elon and they will succeed in Robotaxi network then FSD is the way to go as FSD will be worth a couple of hundrerds of thousands of dollars. I don't think the share price will appreciate that much.
If you have doubts about Elon's predictions than shares is the way to go.
If you have doubts about Elon's predictions than shares is the way to go.