The Best Flarrowverse crossover

Which was the best Flarrowverse crossover?

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Invasion no contest, flash vs arrow and brave and the bold was good while the vandal savage was mostly okay

The one from Flash S1 and Arrow S2 because that's when the writers actually gave somewhat of a shit about character development and logical storytelling.

Invasion without a contest

Invasion. It was basically a 4 part movie.

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Invasion

Invasion even though the end was kinda weak