Both versions are essentially the same model, it's only the paintwork/lining and picked out detail that really differs.
One recent improvement that Hornby did make on the Railroad version, was to replace the plastic buffers on the loco with turned, non sprung metal variants.
IMHO, these improve the look of the model and in the process make it far less fragile to handling.
The main range version for some reason continued to be produced with the original plastic type buffers.
Hope this assists you.