What are some of the majors differences in fish that make a living as "lungers" versus "cruisers"?

The lungers refer to the fishes that sit and wait for their prey to come closer, while the cruisers are the fishes that move in bursts and attain a speed to follow and catch the prey, or one can state that cruiser actively look for prey like tuna.  

The lungers are generally cold-blooded, the temperature of their body is similar to their surroundings. They exhibit lower metabolic rate in comparison to cruisers. The lungers are large in size and possess fewer teeth so they prefer to swallow their prey rather than chewing it. Thus, endurance is low in comparison to cruisers.  

However, the mouth and lungs of lungers exhibit a powerful sucking system, which assists them in catching their prey from a distance. They exhibit heavy crushing plates within the pharynx and can dig deep into the sand. These characteristics of lungers help them to compete with the cruisers.  

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