How to decide to use multiple expense account or one expense account with different products

VinR

Hi
I just want to understand whether to use single account to record my utility expenses and record multiple product and services under that or, have separate account for each different service,

ex: say I have two different bills to pay, Electricity **and **Water,

Should I have two separate expense accounts - Electricity, Water
or should I have one account - Utility and then have two different product/services (Electricity **and **Water) and select it under Item when entering the bill

Thanks