its like one converter at twice the frequency but the switching losses are spread over more devices....also, conduction losses are halved. (in total)
You can use smaller input filter.
Also, since they are each not just switching away at a similar frequency, you avoid low frequency "beating" between the two smps's, which is awkward to filter out.
Another probable benefit of using this topology is that once the stored magnectic energy is scattered among these 2 inductors individually, in theory each one tends to have a lower weight than the one required by the original topology.
Is two identical converters, phase locked to operate at the same frequency but with the switching pulses 180 degrees out of phase.
In addition, there is current balancing circuit, to make sure both converters share the load equally.