Great question!
It depends on things like your planned usage of the knife as well as your personal preferences and capabilities.
And yes, a gut hook is a great tool, but I would prefer an extra tool for the job, like the Buck Paklite Guthook or the Morakniv Belly Opener. Later more on this.
To get down to business: the days of the "survivalist" one-knife-does-it-all are mostly over (for most of us under regular circumstances). When was the last time you gutted or butchered an animal in the field? For most of us, the most we do is to cut the throat after having shot the animal. For that, a simple Victorinox paring knife is enough - I laughed when I heard this at first, but it works! The carcass usually gets skinned by farm hands with the available farm equipment, so why would one even carry a hunting knife? It is close to carrying a camo-pattern jacket whilst on a bakkie hunt.
I have stopped carrying a real big hunting knife several years ago after I lost mine. Instead, I carry a Spyderco Resilience and a general purpose fixed blade (currently a Morakniv Companion) on a daily base. Over the last 7+ years I have never found this combination wanting. The Spyderco is on a pocket clip and the Morakniv tucked away in an IWB-holster.
If one plans to skin and prepare a carcass on your own, the scenario changes and thereby the equipment. I would still use a smaller, sharp blade to cut the throat if necessary. Heart and lung shots bleed out internally, so I don't think it is necessary to bleed them. Head shots is a different story - I prefer to bleed them if possible.
Then, for initial gutting, a dedicated gut hook. In total, it is faster and cleaner than anything else I have seen. Buy one, or make one from a large metal saw blade if necessary. I do not like the gut hooks on knife blades or handles - one does not get a proper grip, and the blade is almost always in the way.
For further gutting, a small sharp blade (3" - 4") with a slightly curved blade works well. With the Morakniv Companion I recently gutted two impalas in twenty minutes.
For skinning, I plan to make myself an ulu-type skinner along the lines of the Trophy Master knife set. A sheep skinner also works great.
For working the carcass I use a combination of a 6" butcher knife with a clipped point, as well as a boning knife and a No 66 Eclipse saw.
Last thoughts on a hunting knife (from a knife enthusiast ;) ) :
- Steel type is important. Many knife companies use 8Cr3MoV or something similar because it is cheap and works easy. I do not like this steel because it does not hold an edge properly.
- Crosscut of the blade is important. Get something with a full flat grind for all work except chopping.