The point of getting a DJM version of 92043 would be the significantly superior mechanism, lights, detailing etc. - e.g. all wheels on both bogies driven, prototypical lighting options, etched grilles etc.
And seemingly for not all that much more money. I have no objection to Hornby offering their model, but it seems overpriced for the features it has, and I'm a bit reluctant to reward Hornby for not retooling their model and bringing it up to modern standards. They could then market a bargain Railroad version and a fully-featured version.
Also, I just fancy seeing two top-notch matching GBRf 92's side-by-side on a layout.