"These are all top of the line high end knives that are built to last and that are made by the best in the business and we can all agree on this."
Unfortunately, you've largely answered most of your own question. I own several knives from all three, and they're fairly similar animals--stout points, thick spines, forward-heavy balance. All are made out of very tough steels which hold an edge well. If you're looking for maximum edge holding versus abrasion (cutting rope/cardboard) 3V has a bit of a lead on the other two. INFI is *possibly* the toughest of the three, it is certainly the most stain/rust resistant.
As to which cuts better, there are WAY too many variables that go into that, depending on the particular model of any given knife and the particular edge grind that was put on the knife by Scott or whoever was grinding edges on the given day at either of the two production companies. In general, Fehrman's factory edges are ground thinner than Busses--this makes them cut better but not as tough. That said, I can change any edge bevel on any knife to be pretty much anything I want, so that really doesn't bother me one way or another. It's worth noting that Busse edges these days are, in general, finer than they were in the "old days" of ten-fifteen years ago. Scott's convex edges used to be extremely thick but have thinned out over the years. I have one of the first Tuskers ever made, and another I picked up just this past year, and they are very different--the old is for all intents and purposes a hatchet--extremely thick grind on a VERY slack belt so that even though the convex grind is full-height, the blade is almost as thick in the middle as it is on the spine, and only tapers down to an edge in the very bottom section. For sheer volume of steel, this is one of the toughest knives I own bar none, but it really does best in splitting/batoning and doesn't cut very well in finer tasks, even after I've pulled the grind a little thinner. On the other hand, the newer tusker is thinner stock and ground with much less slack in the belt, which makes for a more rapid decent in thickness from spine to edge which greatly lightens and thins the blade. Not as hulky tough nor as much power in a chop as its older brother, but much more nimble for anything other than wailing on things and it'll cut circles around the older one.
Also, keep in mind that you can ask for anything you want in edge geometry from any of these makers, providing you're asking for a model that they offer--when you get on the phone with Busse, Fehrman, or Scott, you can absolutely say if you want your edge to be thinner, thicker, etc...though it'd be best to have a particular geometry in mind (i.e. fifteen degrees per side or whatever--obviously that's not perfect if you're talking a convex grind but Scott will know what you mean). Now, Busse no longer has a standard catalogue but makes one or two models at a time in runs, so if you want a specific model they're not offering you'll have to go to the secondary market. If you're not comfortable adjusting your own edge geometry, there are several people on these boards who can easily do a very nice job for you--I'm pretty good myself

--and who will do so for return shipping and a song.
The other thing that can't be explained to you (or anybody) is the ergonomics. You won't know how any knife feels in your hand until you're holding it. There's no such thing as a piece of micarta, or steel, or anything else that can't be filed/sanded re-shaped so again this is adjustable; but anybody trying to tell you that "because knife X feels better to me than knife Y, it's going to be the same for you" is either operating from very limited experience, lazy, or not very smart---very possibly some combination of all three.
I know you want a "best" opinion between the three but truth be told, you're not going to go wrong with any of them. If you find yourself looking at one more than the others, then that's the one you want the most and probably your best bet. This assumes, of course, you're actually going to use it. If you're just going to hug it and squeeze it, Busse has the one advantage that their knives tend to accrue value rather strongly.