Tokyo Gas or TEPCO in Yokohama?

I’ve been using my gas connection with Tokyo Gas and electricity through TEPCO while living in Yokohama.

I know that irrespective of which company you subscribe from, gas is basically provided by Tokyo gas and electricity is basically provided by TEPCO.

What matters is which company you’re subscribed to and who sends the bill to you.

But do you recommend that I should club both these services to the same company or should I leave them as they are?

Of I have to go with one company for both services, do you recommend Tokyo gas or TEPCO?