usually cuts finer. better for mulching.
also usually its the bigger machines that have 4 blades, probably due to cutting more grass.
the things i look for is size. wider mower means less walking. but watch the weight, the bigger mowers need more power and have a bigger engine.
cost of replacing blades is minor, its not an issue.
as long as its a decent brand with quality blades it takes a long time before they need sharpening.
one feature i struggled to find was a side chute. i think its now standard on masports, but its not a great chute. it gets clogged easily as its on the small side.
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