The German armored forces were fully mechanized, they were all thrown into that Sedan attack through the Ardennes. The rest of the army, 80+%, was WW1.
If you want a really detailed book, the Shirer wrote Collapse of the Third Republic. It is very detailed, but goes deep into the political rot in France as well as the military. The Rise of Germany by Holland goes into the battle and explains how France blew it, far less reading. France had the tanks, but scattered them to be nothing more than infantry support. They were better armed and armored, but very slow as they only needed to move as fast as walking infantry. Heck, the Russians had better equipment. A half dozen KV1 tanks almost stopped Army Group North in 1941. Their offensive routed everything including 1st Panzer until they came across some 88s. Because the tanks didn't have radios, the same shortcoming the French had with their tanks, they couldn't develop a plan of attack. The result was they were lost in a suicidal charge. But German tanks, again mostly Mark 1 and 2 with some 3s, had no answer for a KV1 and not many answers for T34s.
But aside from Case Yellow, both in Rhineland and Poland the French had opportunities to stop Hitler decisively. They chose not to. Their army immediately believed every wild exaggeration of German strength they heard. I wonder if Union General McClellan was their muse?