Up to a few months ago we had a little Black and Decker, over 30 years old, which worked well for chopping firewood. But it needed a new chain and was getting hot, so it was replaced with a cheapie from Lidl which is rubbish. Electric is the cheapest to run by miles, but I think you need to get a decent one. Perhaps a battery one would be better, because the lead always gets in the way, but would it run for long enough?