Which half moon lawn edger would you recommend?

I am interested replacing my old one and have noticed that the new models seem to have serrated edges, are these any better than the 'round' edge ones? Any particular brand you prefer? I have heard people mention 'Bulldog; occasionally on here. T i a
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We have recently bought a saw-toothed edge spade and trowel which are great for working in soil that's full of weeds when we're making new beds. Great for working in soil when it's heavy and wet too.
Burgon & Ball Half Moon Lawn Edger with Serrated Head, Stainless Steel | RHS Endorsed | Garden Tool : Amazon.co.uk: Garden