When I lived in a flat with natural gas, the gas was about 1/2 the price of power, but lines charges were $30, which almost exactly canceled out our savings.

In OP's situation I would stick with natural gas. Going LPG on the cooking is not ideal when you have a natural gas pipeline in place (45kg cylinders have a rental cost, need refill orders made, and LPG costs more than natural gas. BBQ cylinders need refilling (or swapping) yourself, and the cost is higher still (especially bottle swapping)

Had continuous gas at the flat (with mixers rather than an accessible controler). The retrofit (done before our time) freed up a cupboard for storage which was useful. Note that they have minimum flows so you can't have a trickle of hot water if you ever need that.

Some of the gas hot water storage cylinders (such as the Rheem Stellar) have sub 30min reheat times, but of course lose energy from the storage tank all the time.