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xkcd #2948: Electric vs Gas
(xkcd.com)
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Well for the lawn mowers, I think it doesn't matter that much what specs you choose. You don't need to be comfortable using it if you don't mow the lawn every day, but it's still better if you choose a better, longer lasting product.
Specs absolutely matter. Incline of your lawn, outdoor outlet location, type of grass you have growing. I'd never recommend a plug in electric lawn mower to someone who needs to mow six acres of hills.
That said, electric mowers by and large are better for most consumers.