The Digi-Cabi and Am-Pro Dry Cabinets come from the same distributor - Digital Point (Formerly known as Celestar [which was the former trading name of the now defunct Alley Photo]).
Be warned that the Digi-Cabi and Am-Pro cabinets sold at Carrefore and the Digital Point outlet at Suntec come with only one year warranty. That is probably why the prices are lower. This might be a point to consider when making your purchasing decision.
Having said that, I have owned a Am-Pro cabinet now for 2 yrs and haven't had a problem with it. The same however, can't be said of the other cabinet(Tropic Dry) I have.
It is of my opinion that the Digi-Cabi Cabinets, while coming from the same manufacturer are made to a lower price point and reflect it. If you can, do a side by side comparison and you will see that the Digi-Cabi cousins of the Am-Pro Cabinets are of lower build quality(inferior ABS plastic trays + rougher metal work + fit & finish + hygrometer quality). I'm not sure about the electronics though but do believe that they are both fitted with the same dehumidifier package to save on manufacturing costs.
But having seen Am-Pro cabinets selling for the same as the Digi-Cabi cabinets, I'd be more inclined to buy the Am-Pro badged versions.