I have no experience with Carothers knives. I've owned two Survive! 4.1's in 3V, one FBF Production Kephart, one SYKO 311, multiple, multiple Bark Rivers and BlackJacks, a bunch of Fallknivens, a half dozen or more BHK's, four LTWK's and more customs than I can count.
I have settled on a Fallkniven F1 in CoS-Lam for my purposes. (I also kept a couple of the older ones in VG10-Lam as "back-ups). I would also be more than happy with one of Bark River's Bravo series. Either of these would be my recommendation. They cut like lasers, have excellent edge retention, sharpen up easily and you would have to really work at it to break any of them.
BHK - I've had difficulty in sharpening some of them -they would only get so sharp and even with a convex edge they did not cut like the BRKT and Fallkniven knives. One exception is an Essiac in O1 that has sharpened up like a razor and has excellent edge retention.
FBF Production Kephart - really nice knife. REALLY nice. Cut well, had excellent edge retention and easily re-sharpened. I only sold it because I use the F1's for everything and it was not getting any use.
LTWK's - I've owned three in A2 and one in 1075. Never tried their 3v, but both the A2 and 1075 were unremarkable with regards to edge retention.
Survive! 4.1 3V - nice design and very comfortable handle. I hated the blade geometry and all of the convex grind knives just cut circles around them. IMHO, one of the most over-rated knife brands in terms of actual performance. I would only buy another one if I could flip it at a profit.
SYKO - 311 Great blade geometry for a cold chisel. Stupid textured coating dragged on everything it cut - which was just about nothing without a ton of effort. Never again.
ETA: I've since tried an LT Wright Next Gen in 3V. My experience with it was similar to the Survive! and BR knives I've owned in 3V. Never again. I hate 3V.
YMMV