it's really hard to compare two knives of such different size and purpose, which is why you are getting flustered replies. But both the Becker and the Trailmaster are actually made in the Camillus factory, so in terms of base quality they are about the same (and probably the same steel). The Trailmaster, as you know, is a big'ol chopper. The Crewman is specifically meant to be a smaller, but very sturdy, "military" work knife.
So if you don't need the knife for specific tasks, it's just a matter of aesthetics - which one looks cooler to you? Are you bored of the Trailmaster, since you don't use it, and just want a change? If so, the Becker is a quality knife - there are many posts saying that the BK7, for example, is the best work knife for its price, or any price up until you reach Swamp Rat territory.
If you do need a knife for a specific task - well, the Crewman is a short stout knife, so it is strong but will not cut as well as a thinner blade (like a Spyderco Perrin Street Bowie, for example). But it's not as thick as a Trailmaster, and a whole lot lighter. Crewman specs are:
5.5" length blade of 0170-6C carbon steel (like Cold Steel Carbon V)at 58-59 RC blade hardness, full flat grind, .188" thick, Black epoxy powdercoat. Handle is some plastic material ("Becker Trademark GV6H") that many people find too slippery or too fat, but others like it just fine.
Hope this helps!
