Cummins Duramax engines offer exceptional power and torque output, with some models producing up to 400 hp and 1,000 lb-ft of torque. They are also known for their durability and long service life. However, they tend to be more expensive than Powerstroke engines. 

Powerstroke engines, on the other hand, are known for their affordability and wide availability of aftermarket parts. They are also easier to maintain than Cummins Duramax engines. However, they have lower power and torque output than the Duramax and may not meet the demands of certain applications. 

Ultimately, it depends on what your needs are and what you are looking for in an engine. It is best to consider both engines and make an informed decision based on your individual needs.