Fielsd use... that covers a lot of ground.... chopping, busting 55 gallon drums, splitting stuff... definitely need a beefier knife in the spine department.
The Nimravus is more of a tanto fighter... serrations are great for cutting rope or going through meat, but as Gary said serrations are a pain to sharpen, even when you know how to work with them.
I own one Busse (long story, but Gary finally made me a sheath for it), a bunch of Harsey/Reeve, a couple of Spartans, a Melton small field, Gerbers, an al Mar/Gerber, a Buck, and even an old Wilderness Explorer... those are a portion of my fixed blades. Fixed Blades are generally for the 'big' jobs and should be coupled with a good folder (my EDC is a Chris Reeve Sebenza Clasic 2000).
The Bravo Smash is an excellent all around knife for a field soldier - it is heavy enough to chop, sharp enough for semi- detailed work, long enough to use as a fighter if needed, and short enough to fit on your kit without rearranging your anatomy.
A knife is a personal choice... and needs to fit your mission... Are you going to use it as a fighter mainly, or as a chopper, or so you need a machete?
the Pacific by Chris Reeve is a good all around field knife, The Green Beret (civilian version of the Yarborough) comes in 5.5 and 7 inch versions; The Spartan/Harsey is a monster (probably the best all around field/fighter I can think of); the Melton Combat Bowie will take down a tree, The Melton 'Sword of God' is another monster with finesse.... a pukka style knife is all most people need....
FIT... there is the key to what makes a great knife for you... does it fit your hand? does it balance properly for you? the coolest knife in the world will be a safe queen if it doesn't balance and the handle doesn't feel right...
Ok.... I'm stopping now... I'll go through my collection and smile because any one of my fixed blades fits properly and balances for me....
(Melton knives.... Melton Knives.... Melton knives.... Chris Reeve knives.... Melton knives.... Spartan Blades.... anything Harsey Designed... classic Al Mar... Melton, Harsey, Spartan. Reeve... not like I'm biased or anything.... Melton, Harsey, Spartan, Reeve...)