Warmer weather and seasonal spring showers means your lawn will be growing rapidly from around April or May. This is probably the time you dust off the old lawn mower and realise you desperately need to upgrade it. If you’ve realised you don’t have the best lawn mower, fear not – I’ve got the ultimate roundup here.A neat lawn – ideally with satisfyingly straight lines mowed into it – has a big visual impact on the whole garden. Even if you have a small patch of grass, a mower will make all the difference. “The biggest mistake people make when buying a new lawn mower is choosing the wrong size and power of mower for your garden,” says Ben Martin, owner of Ben Martin Garden Design. “You don't need a large, heavy, powerful petrol mower, if you have a small flat garden. An electric or battery powered push mower will more than suffice.”I asked Ben what buyers should prioritise when it comes to choosing their next lawn mower and he said: “Blade sharpness is key; blunt blades will leave a scruffy, untidy finish. So keep your blades sharp and clean and you'll reap the benefits. Power comes next: you don't want to be struggling through longer grass and stalling regularly. Cutting width comes in third. If you have a smaller (narrower) mower, things will just take a little longer.”So let’s take a look at the mowers that are a cut above the rest.Read more: 9 best outdoor storage boxes to keep your garden tidyI tested lawnmowers for big, small and bumpy lawns (Zoe Phillimore/The Independent)Best overall – Ego LM1914E-SP self-propelled lawn mower: £729, Egopowerplus.co.ukBest budget buy – Stihl RMA 235 cordless lawn mower: £184, Stihl.co.ukBest for a striped lawn – Stihl RMA 448 RV rear roller cordless lawn mower: £829, Stihl.co.ukBest value – Worx WG749E lawn mower: £449.99, Worx.comBest compact mower – Worx WG737E lawn mower: £259.99, Worx.comRead more: Best secateurs for pruning and trimming, tried and tested by a gardening expert