Wood offers a renewable and sovereign source of energy. Wood fuel is available in plenty and there are lower chances you can lack ready wood fuel for sale. As for oil and gas, they are non-renewable so you can expect them to run out any time without prior warning. As for electricity, it is produced by burning fossil fuels which a limited commodity meaning it can run out any fine day.
Electric fireplaces are easy to maintain and do not require lots of cleaning. They don't produce ash and waste and are relatively maintenance free. Smoke and ash can also be hazardous to the health therefore these electric units are very favorable in houses with old people and small children.