Definitely a very odd battle.
Probably the Somua S35.
Near equal road speed and superior off road speed, better armour overall, and a shorter height (always important for hiding).
Also, at the time the Germans were winning, so I can call in artillery or infantry to help out if necessary, and more of those than my enemies could (at least in terms of combat effectiveness).
A lot of it is probably due to bias toward France and Germany during this time period in general though.
I’ll say before researching I overestimated the Somua S35’s “superior to most German tanks in the Battle of France” capabilities and severely underestimated the M3 Lee/Grant’s “hopelessly obsolete against the Japanese” capabilities, at least on paper.
I think I was confusing the M3 Lee/Grant with the Stuart.