I can pick just one so I went with what I have the most, frame lock. But I would have liked to pick three, compression, back and frame.
Spyderco Collection: Military (S110V), Bob Lum Darn Dao(CPM-154), Yojimbo 2 (1 in S30V & 2 in 20CV), Sustain(20CV), Native 5(Maxamet), Jumpmaster 2(H1), Province(4V). SHORT LIST: CF Shaman(S90V), Lum Tanto, Native Chief(?), Street Beat (AEB-L, NioMax or Nitro-V at 63HRC).