Where would enlightenment thinkers find the most freedom?

Switzerland and the Netherlands were the most liberal countries at the time so the philosophes/enlightenment thinkers would have their books published there because they risked it being banned or burned if they tried to publish somewhere else.

The peak of the Enlightenment was in France, however, because:

1). French was the international language (similar to what English is today)

2). French intellectuals were not persecuted or punished severely

3). French people had the habit of preaching their ideas to the public