I do know the Honda is an excellent tiller,alot quieter than the mantis and the echo,the earthquake wasn't a bad tiller either,but you cant go wrong with that Honda,
The echo tc-210 has the Istart starter which is spring assisted starting. You just pull slowly on the starter and the spring kicks in and spins the engine over-very easy and works well. Mantis does not have that.
The echo is gray(now orange and black) not red, guess that is obvious, sorry.
The mantis has a different handlebar (chrome) and the grips seem larger on the mantis.
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The newest mantis have a deluxe handlebar that is very nice.
Plus the deluxe model does have the Istart starter.
The mantis company is really good at packaging and marketing the tiller accessories and is a dedicated tiller company.