I would disagree with both: as soon as petain took office he had to accept he was the puppet of the occupiers, and the various attempts to turn Vichy into a refoundation of France come across as delusional; Hitler was always going to do what he did, and in fact his state relied on the continuous plunder of war.
For Hitler... should have taken a break before Poland, or at least after France, and not gone to war with the Soviets and made clear that Japan shouldn't attack the US. (Glad he made his mistakes so he was defeated, but just looking at it without the moral lens for a moment.) And maybe just do new, limited, campaigns over the years.
The difference is unlike Napoleon, Hitler's main enemy from the start was the USSR not the British. The Western Front was more to done to ensure the Nazis would not face a two front war when battling the USSR and from June 1941-June 1944 there was basically no 2nd front .
I would say for Napoleon invading Russia was a mistake given his main enemy was the UK
