Both can work. The right first product is the one you can deliver well this week.
Digital: fast to launch
No stock, no shipping, instant delivery. Great for templates, presets, courses and music.
Physical: easy to trust
People can picture it, hold it and gift it. Margins depend on sourcing and shipping.
Why not both
One store can sell headphones and a course side by side, and the checkout handles each the right way.