Closing Recommendation
Both machines share the same engine and the same service, so the choice is only about reach, cabin and weight. Choose the Liugong 915E when you dig canals, ponds and wide foundations and want to cover more ground from one position, and when you want an AC cabin fitted from the start so your driver works steadily through the hot afternoon. Choose the Liugong 914E when you shift sites often and want the lighter machine that costs less on every trailer trip and sits better on soft field soil, with AC added only if you need it. Compare the two prices after adding AC, or the comparison is not fair. So match the machine to your work: 915E for wide digging and driver comfort, 914E for frequent site moves and soft ground.