import pandas as pd

​

df1 = pd.DataFrame([[1, 2], [3, 4]])

df2 = pd.DataFrame([[5, 6], [7, 8]])

​

def myfunc(a, b) :

  if (a.sum() > b.sum()):

    return a

  else:

    return b

​

print(df1.combine(df2, myfunc))

​