When 200 Watts plus is needed - to parallel or to not?

At lower voltages, there are a number of control chips that will provide this function - i.e. mutli-phase several outputs. But for higher voltages, for instance 300Vin to 300Vout at 500Watts there is a benefit of paralleling several smaller converters. One small converter is easier to design and can be made small and robust, so phasing several converters - or interleaving 2 converters has some benefit.

What are your thoughts? Do you use a load share chip? If so, which one and why?