I attached you two images of the same circuit folded cascode opamp, one from Jakb Baker and the other from Huihsing
in jakob he is bising the current source of the upper transistor using the half value of the tail current of the differential pair,
in Huijsing he is biasing using the same amount of the biasing current,
As a result the currents as you can see will be different at the down mirror .
Better in what aspect. One is better for slewing, the other maybe for noise. You have your specs and you have to choose the circuit and biasing that is the better fit.