Well, countries have experienced moderate inflation and moderate deflation, ask the ones who lived through both which one they preferred.

Moderate deflation is fine, it's good even. But only as long as nominal GDP stays stable.

See the so called 'Long Depression' in the 19th century. Which was only a depression of the price level, everything else did well.

For a more sectoral example, see how computer hardware used to get cheaper and cheaper all the time, but total spending on hardware went up.