Try to choose those that uses the FlyBack principle in place of Forward converters. Its a rather technical point, but several authors of books about SMPS remark that FlyBack converters have the larger bandwidth and the best dynamic range of all topologies. Now, how to distinguish SMPS of the FB from Forward: quite simple: the FB has no output inductor, generally a toroid or a second EE core similar to main transformer. All forward converters has two or more larger cores.
This is my 25-years-old design with only one large core: FlyBack topology
This is my 25-years-old design with only one large core: FlyBack topology
