Back when they were each just three films, I might've said Bourne, but I think so highly of both Ghost Protocol and Rogue Nation that those two films alone make M:I the overall better franchise for me.
It's tough because the last two Mission Impossible movies were really well done. I love the original Bourne trilogy, but then you have Bourne Legacy which was awful and Jason Bourne which was very flawed.
I didn't find the right solution from the internet.
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