I like Baldwins better. The company made all customized locos for companies around the world. Their ability to produce customized solution for their customers with a steam locomotive is legendary.
Big Boy (ALCO): The largest successful steam locomotive, weighing 386.125 tons (without tender) with 135,375 lbs of tractive effort.
Baldwin Giants:
Northern Pacific Z-5: Weighed 358.5 tons with 159,330 lbs of tractive effort (higher pulling power, but lighter).
Great Northern R-1/R-2: Weighed 289 tons with 142,165 lbs of tractive effort.
Baltimore & Ohio EM-1: Weighed 314.35 tons with 115,056 lbs of tractive effort.