Closing Recommendation
Both machines exist for the same reason, to reach where a normal excavator cannot, so pick by the width and depth of the water bodies you are called to. Take the Liugong 930E XLR if you work wide canals, rivers and deep tanks, because the extra reach is exactly what the customer is paying for and falling short means doing the job twice from two sides. Take the Liugong 925E XLR if your work is village ponds, field channels and regular drains, because it reaches far enough for those jobs and is easier to move and manage. So match the machine to your work: Liugong 930E XLR for wide canals and deep river cleaning, Liugong 925E XLR for regular pond and drain work.