The measure for power is kWh, so look at the cost you are paying per kWh for gas vs electricity. We're all paying different prices because tariffs are in a state of flux but gas has always been cheaper than electricity per kWh. That's hardly surprising, considering that (some) electricity is produced by burning gas so is bound to cost more.
As for the efficiencies of different styles of cooking; it may not matter in Winter because the wasted energy that's not used for cooking will escape into the household and contribute to the heating.
The best way to economise is to use less energy and insulate more. Look at your entry consumption and start with the biggest spends first (almost certainly heating). Drop the thermostat setting and wear more clothes.
As for the efficiencies of different styles of cooking; it may not matter in Winter because the wasted energy that's not used for cooking will escape into the household and contribute to the heating.
The best way to economise is to use less energy and insulate more. Look at your entry consumption and start with the biggest spends first (almost certainly heating). Drop the thermostat setting and wear more clothes.