That is a very long debate. You will get some folks like TheGame and WilliamM who prefer large blades for the activities they do. Whether an axe or machete does better than a chopper-sized knife has a lot to do with what is being chopped and where. I'm for example told that in certain desert scrub environments the combination of thorns on branches and very dense wood makes a thick chopper knife the preferred tool. Others seem to prefer a machete. Where I have compared machete and chopper knife performance in my preferred environment the machete seems to win and the axe trumps them all.
Since we don't know where you are from, what environment you hike in and what kinds of things you do while you are in the outdoors it is impossible for us to recommend a good knife to meet your needs. I encourage to read some of the earlier threads on chopper knives, mid-sized knives and bushcrafter knives. Use these terms as keywords in your search. You will find interesting debates and conflicting opinions for each category of blade length.
Personally, I like the ESEE-6 quite a bit. But like I said earlier, when I bring the ESEE-6 it spends most of its time attached to my pack and I have a 3.5" Bruce Culberson knife that does the majority of fine blade work. In fact, most people here will recommend a combination of tools rather than a single edged tool. It is always the best configuration for versatility and efficiency of outdoor tasks with the only compromise being weight and packing volume.