CTA for $500 course - "Buy" or "Book a Call"?

I am planning to run FB ads soon for my program. It's priced around $500. What would be a better CTA - giving them a "Buy" option straightaway, or asking them to "Book a Call" with me?

If I give them the "Buy" option, then I will have to lay out all the details of the offer (and the bonues) within the VSL . Right? (which will increase the VSL length to about 35 minutes...I'm thinking it's probably too long)

But if CTA is going to be "Book a Call", then I think I don't need to give them all the details within the VSL. Right? (resulting in a shorter VSL).

Any suggestions?

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