Closing Recommendation
Both machines dig well, so the contract you sign should decide, not the specification sheet. Take the JCB NXT 145 Quarry Master if you work quarry faces, deep pits and light mining, because deeper digging and faster swing suit loading from a face all day, and the machine is meant for that constant duty. Take the Hyundai R150L SMART Plus if your work moves between road jobs, foundations, levelling and general trenching on normal soil, because the higher power and digging force cover all of it without paying for quarry duty. So match the machine to your work: JCB NXT 145 Quarry Master for quarry faces and deep pits, Hyundai R150L SMART Plus for general construction and road work.