Closing Recommendation
Both are practical 14-ton class excavators, so pick by your ground and what you spend after buying. Choose the JCB NXT 140 when your soil is hard and higher digging force cuts your passes, when dust and heavy rain demand better sealed electrics, when you need service and parts in almost every district, and when an easy sale later matters. Choose the Sany SY150C Pro when daily diesel is your biggest cost, when deeper digging helps on drains and foundations, and when a lower buying price lets you keep more working capital. So match the machine to your work: JCB NXT 140 for hard digging, tough sites and service reach, Sany SY150C Pro for lower fuel cost and deeper reach.