All of them (except the Ryobi*) are probably just generic Chinese stuff with a made up name stuck on them. Screwfix’s own brand Titan do one of the 4-in-1 ones which is about £170 iirc. I had the strimmer/hedge trimmer version of it (£130 ish I think) until some c*** broke into my garage and stole it. The first one I had worked once and then wouldn’t start. The second one kind of worked, but would bog down and stall on full throttle, I just had to learn to hold it at about 95% and it was fine.
TBH, I’ll probably buy another in the summer. It’s useful for the hedges and for patch of grass that we use as a driveway (it’s private land, before anyone gets upset) and if it stops working I can just take it back to Screwfix and they’ll give me a new one without any hassle. I wouldn’t buy one online. Posting it back to an Amazon affiliate could be horribly expensive.
*I’m sure someone will be along shortly to say the same about Ryobi, but at least it’s a ‘known’ brand.