There is another option... Walk behind trimmers powered by 2-stroke engines. I have two. A tiny one that gets used often, and a larger one that never gets used. The larger one, 17" , has power enough to march thru anything, but it's just big enough to no longer be a trimmer as much as it's a small brush mower.
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There's some discussion of the major engine brands. I've discovered them to no longer be worthy of their past reputation(s).
eg: Honda products. I've owned many and still do. I have a Honda 2200i generator that refuses to start easily when cold. It's been to the shop, has undergone a recall, but it still wears me out to get it started. My recent "Firman" generator, wouldn't run at all. Took it back for a refund. My previous two "Champion" brand generators started effortlessly. I've had three new Honda mowers in the last three years. Two of them have been horrible to start. The most recent, bought one spring ago, after 4 uses, it began surging terribly. Took it to the Honda dealer. They agreed, "it's surging". Their fix? Leave it with us. We're 4 months behind and should be able to get to it by end of summer. Really? What good is their world class warranty if they're so far behind they can't even schedule it for service. I took it home, removed and disassembled the carburetor, and found a small piece of red plastic in the jet. Still doesn't start easy when cold, but once running, it runs great.
I have a riding mower with a Kohler engine. In spite of a plethora of service and trouble shooting, it often requires starting fluid to get it started.
I've about given up on the major brands.