Closing Recommendation
Both machines will do the earthwork, so the real question is how much a stopped machine would cost you. Choose the CAT 320D3 when your contracts have deadlines or penalty clauses, you own only one machine, or you want careful fuel use, a settled parts network and an easy sale when you upgrade. Choose the Zoomlion ZE215E-10 when you want more engine power and a bigger bucket for a lower buying cost, your work is steady without heavy penalties, and your dealer can show you real parts support nearby. So match the machine to your work: CAT 320D3 for reliability and an easy sale later, Zoomlion ZE215E-10 for more output at a lower cost to buy.