Whilst the rates might generally be better for commercial customers, it's worth remembering they may also have to pay 20% VAT on their tariff compared to the 5% paid by domestic customers. In addition, businesses in the UK are required to pay the Climate Change Levy (CCL), with the current rate set at £0.541 pence per kWh of electricity used, and £0.188 pence per kWh for gas.
There is an exception to this rule, however, and your company won't have to pay CCL and will only pay 5% VAT if you use less than 33kWh of electricity and 145kWh of gas on average per day.