You've got a few options:-
Big knife, small knife. For example the Puukko & Leuku (Traditional tools of the Sami)
Or theres Uncle Ray's favored option. Small knife and axe
Then theres the All-in-one-knife, quite popular over the Pond.
The TOPS edged item in the OP is an example of this, my main arguments against this idea are there are (to my mind) too many compromises trying to make different bits of the blade be different tools (thereby making none of them good tools) and secondly field-maintenance is difficult because of all the strange curves (all of which need to be sharpened exactly to spec.). One last thing, lose, damage or break your one knife and you have no usable tool........Unless you carry a spare, in which case why have an AIOK ?
I tend use a variation on Big knife, small knife (Bill hook and Opinel) or the classic Axe&knife (long handled Kent and a mora type in my case)
Machete are better for bramble and springy 'jungle' type brush, axes for stiffer woody growth. Bill hooks are pretty good on either (better on bush then bramble though)
Price is something to think on, always ask yourself "How much would it hurt if this never came home?"