Plastic handled users, mostly Spyderco Salt models with serrated blades, and a Hogue Ritter RSK
Ti & CF folders for urban EDC (CRK, Buck, Spyderco, Böker)
Fixed blades and folders with wooden and burl scales (Bark River and rescaled Spydercos)
SAKs (Victorinox)
Machetes, mostly parangs (Condor)
Traditionals (mixed bag)
Abandoned/aborted sub-collections: black tactical stuff (I still like the camo/DLC Military though) and made in China affordables (Ruike, Steel Will)
It is hard to pick a favorite group. I always liked titanium frame-locks the most, but I can't work/live (at least properly ) without my plastic beaters and the SAKs. And without the organic beauty of the burl and wooden group, my collection feels too austere and bleak.
In theory, I could keep a couple of pieces from each group and be happy, but realistically I think the Ti & CF collection will slowly keep growing, and the knives in all the other groups will be just replaced if lost or damaged.