We heated with a log burner for about the first 15 years that we owned our french home, our appartment prior to that had a storage heater, which was actually very good.
And then they put gas lines into our village and the first lot, finished about 10 metres from our house, so I asked if we could have it, and was told if at least one neighbour wanted it too, we could. So we and the neighbour took it.
For us, it was more economical than buying wood, as where we lived it was always expensive, we used 7.5 tonnes every year ( remember that was only from Oct/Nov to April) and often it was getting on for £90 a tonne, and even buying in bulk was not that much cheaper.
I have friends in France, who now have granule burners and find them economical.
I have recently renewed my gas/electricity contract in England and have compared prices and gaz is a lot more expensive in France for the time being. We use about 12000kwh of gas per year, and would probably have used more in France as it would have been a lot colder where we lived. Plus ofcourse the abonnement is a lot dearer in France too.
If you decide on gaz de ville, then get a good boiler, that is as economic as it can be.