I've done every possible lay up option over years of laying up cars. In the end, do whatever you think is best.

The issues are these.

The clutch plate may stick
The brake calipers and or cylinders may stick, or the handbrake may stick
Condensation can rust the fuel tank from the inside
Fuel can go off
Condensation in oils may cause additional wear
There may be rodent damage
Excessive moisture may cause external corrosion to exposed surfaces
The battery may give up

So far...................
I only ever had one clutch plate stick
I only ever had one tank of fuel go off, because I left it too low

The answer is simple. Get your car out and drive it at least 25 miles at a time. More is better.

DaveW
'05 Red Roadster S1
'16 Yellow (Not the only) Narrow AR GDI Plus 4