If you are talking petrol powered, then Ryzen has already stated the best options .. if you are talking battery powered then Stihl or Husqvarna would be my choice.
Think about it .. every time you see a groundworker or contractor using a petrol powered tool , 9 times out of ten .. it is coloured orange and white .. that equates to a Stihl tool.
If you are thinking electric then .. who knows.
I have had a Stihl petrol strimmer for 5 years and it has always started first or second pull. If I wanted to sell it today, I will more or less get my money back for it.
You could always buy a cheap sub £90 chinese one from the many retailers who stock them and then throw it away next year when it wont start and it will cost at least £50 to have someone look at it.
Like everything in life, you get what you pay for.