Hi Scout, I wanted to chime in a little on the BTAC vs 4.7, and also offer another possibility for you--the Spartan Difensa.
I don't have a BTAC, so I can't really give you a good idea about how it performs or feels in hand, but you can bet it will be the toughest of these knives by a good deal. It's probably going to need some edge reprofiling if you want to get it to the level of slicing that the other two knives enjoy. SR-101 is also likely the least stain resistant of the three as well, though it could be that CFV is less so. They should be close in this regard. Busse is my favorite knife company and they offer the best warranty and customer service in the industry, imho.
I have a 4.7 CFV and while I don't know what is going on with S!, I know they sure make one heck of a knife. I haven't used my 4.7 hard, but from all reports it is similar in application to 3V, with less stain resistance and toughness, but with the added benefit of being much easier to sharpen. This is a capable tactical blade, but where it really excels is in bushcraft duties. It is a demon at carving wood. The handle is super comfortable and works in a large variety of grips. I don't know how warranty work with S! would go.
The Difensa is made with S35VN, which of course is well known as a relatively tough stainless, though it will not stand up to abuse or have the edge stability of the other two blades mentioned. Still, I find it has a very nice balance of properties if you want a "worry free" steel--it has high abrasion resistance and won't often require sharpening (though it is a pain if you let it go too long and try to bring it back) and of course the corrosion resistance is very high, especially with Spartan's PVD applied, which really adds almost no discernible drag (but nor does the S! Cerakote). Spartan S35VN is heat treated very well, so the grain structure seems fine and the blade holds up better than you might expect. In hand this blade really shines, as it is bar none the most comfortable knife I have ever held.
So, in summary
Toughness: BATAC>>4.7>>Difensa
Edge holding: Difensa>>BATAC>>4.7
Stain resistance: Difensa>>>4.7>BATAC
Sharpening: 4.7>>BATAC>>>Difensa
Handle: Difensa>>4.7 (?BATAC?)
Wood carving: 4.7>Difensa (?BATAC?)
Self defense: Difensa>>4.7 (?Batac?)
Warranty: Busse>>>Spartan>>>Survive
Essentially, I think the 4.7 is the best woodcraft knife, the Difensa is the best soldier's blade, but then, you can never go wrong with a Busse!