Busse, swamp rat, bark river, fehrman, caldwell, koster, fiddleback - seems like we have similar taste in knives. Your collection includes many of the fixed blades I have (and a lot more besides)..... I just need to keep reminding myself about the selling on part.
Well I commend your taste in knives and I sympathize with your selective memory - we seem to have a lot in common, like most of us here I guess.

I was admiring your Koster Muck yesterday. I want one.
So which do you like the best of them all?

And which do you use most?
If for some reason I had to end up with only a small number of knives, it would look like this:
2 fixed only - large and small:
Add a folder:
3 fixed only - large, small and pocket fixed:
Add a folder:
4 fixed only - large, small, pocket fixed and a specific purpose knife:
Backpacking combo:
Pocket carry / EDC type / urban carry, around town, whatever term, you know what I mean:
Favorite and most used:
Fixed
Folders:
What I like about each:
What all of them have in common are comfortable and versatile handles (in any grip) and high performance - i.e. chopping for the large ones and slicing / efficient cutting for the small ones.
The B11 is the Asymmetric model. I have the other as well and like it but the Asym is better for me.
All of them, except for the Benchmade 171, are lightweight and very versatile. The 171 is neither, so it is unlikely it will ever make it into my extended duration backpacking pack, but it is the best chopper I have and I love using it to chop and baton with.
The Browning Crowell / Barker and SAR 8 are the smallest and lightest fixed blades that I still consider good choppers. They are light and fast in the hand and I enjoy using them for large knife and small knife tasks. My favorite Browning Crowell / Barkers are however not the standard ones (which are still good) but re-handled and re-profiled ones that are much sharper and more comfortable in the hand. The standard handles are a little too square.
What I specifically like about the Caldwell is that I can control the cuts with it very well. Where the Skookum and the other small ones are very good cutters, they tend to sometimes bite more than I want. That is not a problem for any type of cutting that I would actually need to do for my uses, feather sticks, tent pegs or whatever. But sometimes when I just want to carve things like flat surfaces, just because I want to, the Caldwell works better than anything else for me. And it is 154CM so provides some options for stainless in my collection.
What I specifically like about the Bark Rivers, the Canadian Special and the Liten Bror is that they were factory modified for me with rounded spines and rounded handles, so when I want to do a lot of work with my thumb on the spine, they are very comfortable for extended use. The Canadian Special specifically, with the upward slope provides great traction for the thumb without any jimping, which I HATE on a knife. I typically HATE any hilts, jimping, finger cutouts etc. on a knife handle but the Canadian Special cutouts fit my fingers perfectly, and I don't feel them at all even in chest-lever grip.
I carry the Fallkniven(s) to the beach mostly because they are stainless VG10. I also use all my Fallknivens in cold weather when I don't want to wear gloves.
Folders:
I like the Sebenzas because I like the Sebenzas.
I like these two Victorinox because they have saws and awls / reamers. I actually prefer the Pioneer Harvester over the One Handed Trekker for many reasons and there are many things that I don't like about the OHT but I carry it more in the woods because so far it is the best option I can find with one handed opening and closing, an awl / reamer and the longest saw in a folder.
I also prefer the Pioneer Harvester over the Farmer because it does not have the split-ring attachment, that on the Farmer digs into my palm, and the Pioneer Harvester has a pruning blade, that I prefer over a bottle opener / flat screwdriver.
And my disclaimer

.
My current choices do not mean that they are the best even to my preferences. They are only the best of the ones I have used and tested sufficiently. There are some knives in my collection that have seen very little or even no use and they may displace some current favorites.
That holds true especially for the mid-sized knives because I find them to be too much of a compromise so I do not focus much attention on them, but I will in future. Because of that there are some knives that I really like, like the Chopweiler for instance, that are not listed under my absolute favorites, purely because I prefer a large and small combo over a single mid-size. But I know that I could do just fine with any of the mid-sized ones also and I do use them and enjoy using them. They are simply not my first choice.
And that is really the criteria for my collection. I ask myself, if I closed my eyes and grabbed any knife (other than a few that were gifted to me that I keep for that reason), would I feel comfortable, trust and enjoy using that knife in its role and within its limitations, within any possible scenario. If the answer is not a definite yes, the knife is not here. But I do find that my tastes are becoming more discerning as I learn more and as some knives set new standards, some of these will probably have to go.