In intellect range, Batman would win. Even though Peter is very smart, he's still a teenager. Which means he's still learning. Bruce is an adult who is also a detective. So Batman has the upper hand in mental strength.
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Batman VS Spider-Man
FanfictionDC Universe's very own Dark Knight versus Marvel's friendly neighborhood Spider-Man. Who would win? We're about to find out.
Intelligence
In intellect range, Batman would win. Even though Peter is very smart, he's still a teenager. Which means he's still learning. Bruce is an adult who is also a detective. So Batman has the upper hand in mental strength.