tradertator
Grandmaster
A thicker blade will take more abuse, but a thinner blade will have a thinner edge and feel sharper. I prefer the 4 or 6 for task such as skinning game, where as the 5 makes a much better chopper. The fire bow drill pivot in the 5 is a pretty cool feature that I have grown fond of, and comes with a sheath that has has more retention. All three of the blades you mentioned will get the job done.
The Kabar lacks a full tang, making it prone to breaking if your using it for abusive task. The Becker has never appealed to me due to the overall feel of it (mostly being the handle) but would work fine if your on a tighter budget.
The Kabar lacks a full tang, making it prone to breaking if your using it for abusive task. The Becker has never appealed to me due to the overall feel of it (mostly being the handle) but would work fine if your on a tighter budget.