I have a petrol one a it’s powerful, cuts through most things easily Sthil, but is messy and noisy. Great for large areas with thick weeds. It’s about 10 years old, but mixing two stroke petrol and priming and starting all take time.
Bought a battery one this year Makita already have their batteries for other power tools. Been really impressed easy to use, light and no mess. A great bit of kit and if you are just edging the lawn I would recommend.