I have run both. Last week I purchased a new navigator. I did not like the controls of the older ones. I have always run walkers and still run a MBK with a mulch deck. In my opinion walker cuts better but navigator has been better for cleanups. The nav speed is better cut wet grass better. Less maintenance and with workers running my equipment the exmark fit me better. Also my walker dealers service is less than par and turn around is very slow and not very knowledgable. Exmark dealer is top notch and has very quick turn around and have demos if it's down more than a few days. That help me make my decision.
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