Ok I'm going to stir the pot a bit. My daily carry is a Leatherman Surge in a belt sheath. It is a bit heavy but I am a bit of a boy scout and always want to be prepared. That being said I have an Opinel #8 from my father in law that I carry when I dress up because its nicer. Just food for thought.
I've got two and love them. The Speed Safe opening is so rugged and easy to use.
They have a nice edge that I mucked one up but brought it back to factory or better with my new Gatco sharpening system (like the Lansky).
For the price, I am very impressed. Mine are just cheapo $40-60 ones, made in China but love them. I actually paid less as they were on sale or Massdrop.
Ontario rat 1 is a fine budget knife that is tough. Aus 8 steel is easy to sharpen and takes a very nice edge, edge holding is better than most in its price range. Seen one go through 2 tours of duty in Iraq and still the mans edc..
There's an old man in England still making traditional slip joint knives. He's old and won't be around forever and when he's gone his knives will be gone. He makes cheap user knives and finds the idea of high end knives amusing, Use em till they're broke them buy another is his thinking. They're made of a fairly soft carbon steel which can be sharpened easy and quick on the go. A flat rock will do the job.
I used to carry one of the small to mid sized two or three blade Case Knives. About 20 years ago I discovered Benchmade, that I can open with only one hand. Downside is that they only have one blade, but excellent steel.