My verdict: the quick solution for French company lists.
Societe.com is practical but the data is accessible for free elsewhere if you know where to look. The base for creating a prospecting list on local data. It's very fast, very simple and usable by anyone. However, it's a bit expensive and you can get most of the data simply by playing with Open Data if you know a bit about it.
What I like less: the price for data that is public and freely accessible via Open Data (INSEE, data.gouv.fr). You're essentially paying for ease of use.
My advice: if you need lists quickly and don't have the time/skills to leverage Open Data, Societe.com does the job. Otherwise, check out Pappers (often cheaper) or learn to use Open Data directly.