On a 5 ton XCMG I would not judge it only by the purchase price or the warranty length. The practical question is whether the local dealer can prove parts and support before the machine is down.
I would ask the dealer for a written parts/support file:
- exact model and serial range, not just "5 ton XCMG"
- engine model and engine-plate photo
- hydraulic pump, swing motor, travel motor and control valve tag photos
- filter numbers, belt numbers, seal-kit numbers and common hose/fitting standards
- bucket pin, bushing, track width, sprocket, roller and idler dimensions
- stock photos of fast-moving parts in Greece or Europe, not only a promise from China
- warranty exclusions for hydraulic parts, electronics, travel motors and undercarriage
- expected delivery time for one urgent part, with freight cost
If they can give those details, a new cheaper machine may make sense for lighter work. If they cannot, I would compare it against the used Cat by downtime risk, not only hours and price. A 3 year warranty is only useful if the dealer has the parts and authority to act quickly.