I have owned both and both have proven very reliable with proper maintenance. Currently Im running a Gravely with the Hydro Gear 5400 transaxles. They are the quietest, most responsive and smoothest operating I have ever owned. Transaxles have fewer leak points, no cross contamination and a lower center of gravity. Each transaxle has its own fan, filter and reservoir. If you were to ever have a problem the whole unit gets replaced which costs less than seperate pumps and motors.
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