Closing Recommendation
Both are capable small machines with an AC cabin, so decide on how you use it and where you dig. Choose the Komatsu PC71 when you give the machine on rent and GPS lets you bill the hours actually run without argument, when slightly more rated power suits your work, and when finding a buyer easily later matters to you. Choose the XCMG XE80C when your ground is loose soil, gravel or small slopes where more tracking force keeps the machine gripping, when more torque helps it keep digging through resistance, when faster travel saves time across a site, and when a bigger hydraulic tank suits long working days. So match the machine to your work: Komatsu PC71 for rental tracking and easy selling later, XCMG XE80C for grip, torque and long days on loose ground.