I'd vote for stickering it and not dead piling it, if it is air dried now.
The eb and flow of different humidities will cause some shrinking and swelling, so having that happen uniformly on both board faces will give you better long term storage.
There are tradeoffs but stickering will be a good way to go.
Guess I would say the same if it is kiln dried now. But would expect the wood to gain some moisture over time.
All depends on the relative humidity during storage.