what is the best route for my shed? what amperage should I use?
A 30 amp and 60 amp two pole breaker are basically the same price.

The panel is the same price in both scenarios.

The labor to install it is practically the same. 

The only difference is the price of the wire.

For 70 feet of wire price difference I wouldn't skimp on this one.

I would go for scenario #1 and have enough capacity for future expansion.

Good luck!