Depends on what's being cut.
For fine cuts (paper / string), my Spyderco Calypso Jnr PE is a regular little pocket razor.
For heavy canvas, think plastic or thick rope it would be my Spyderco SE Police.
For carving points on wooden spikes, opening cement bags or cutting medium rope it would be my Spyderco PE Military.
The best all rounder I have, and the one that gets carried most often is my Spyderco PE Ti-Salsa. Ok, ATS-34 might not be one of the new "super" steels, but it is damn good, I can get it almost as sharp as the Calypso Jnr, it's as robust as the Military, has probably the strongest lock of anything bar a fixed blade, and the tip is robust enough to tackle a fair amount of accidental abuse.