Cat Tractor vs HELI Tractor

Cat Tractor and HELI Tractor Which one is better? What is the difference between Cat Tractor and HELI Tractor which is of good quality, the editor learned through comparative analysis Cat Wheel Tractor-Scrapers 631K (Tier 4 Final/Stage IV),Cat Wheel Tractor-Scrapers 621K,Cat Wheel Tractor-Scrapers 637K (TIER 4 FINAL/STAGE IV),Cat Wheel Tractor-Scrapers 657G,Cat Wheel Tractor-Scrapers 637G,HELI H2000 series Tractor,HELI Platform Trailer Tractor,HELI 3-8t IC tow tractor for use on highway and railway Tractor,HELI 20-25 ton AC type electric tractor Tractor,HELI G serious 15-30 ton AC type electric platform truck Tractor performance characteristics and detailed parameter configuration for the majority of netizens to refer to, understand Cat Tractor and HELI Tractor Which is better, please pay attention to global-ce.