What is the best weed eater to buy?

That all depends- how much grass do you have to cut, and how often? Do you have a 20 X 50 yard, and do you have 5 acres to mow? Do you mow 3 months of the year- or 8 months? No one lawn, no one answer. The very BEST lawn mowers are professional grade equipment used on Golf courses- they sell for about $50,000 each. The average homeowner has no need for one of those.