Most of the coins I have bought lately have been French. In part it's because they're more affordable than
US coins I like. My interest is pretty narrow though - late Royal through pre Napoleanic, with a slight interest in the Republique 5 francs issues from the 19th century.
I'd suggest going over to
https://www. cgb.fr and having a look at their enormous collection of photos. For starters, look at anything designed by Dupre....
-5F Union et Force
-The "genie" silver coins - 15 sols up to ecus.
-The decimes and all their restruck variants.
-The sol aux balances - some of the scariest coins I know of - from the period of the terror.
Compared to 1793-96 US copper and silver these coins are every bit as attractive, and probably just as rare. How many 2 sols aux balances were ever made at Montpellier mint - and how often does one ever reach the market... The number of mints and overstrikes involved makes scarcity the rule rather than the exception. Grading is a little dicey, because there's very little slabbing, and corrosion doesn't seem to count against grade.