SAKs are the best. I EDC a Hiker, I think, I've had it so long I can't remember it's name, with a saw blade and awl instead of corkscrew. I have several others I carry from time to time for different purposes.
Probably the best all-around knife, if you can only have one, would be a SAK locking folder with saw blade and awl, no corkscrew. I've never found any use for a corkscrew, but use the saw and awl regularly, more than even the knife blade. There are many models, find one that has what you want on it and enjoy.
I also have Gerber and Leatherman multi-tools which I sometimes carry, in addition ot the SAK, but the SAK is always with me.