As with most things in life needs and taste change over the years. In my younger years it was always a stockman folder. Usually it was a Tree Brand or Case but once an Uncle Henry and a Buck. I had a Queen Steel fixed blade as a hunting knife. While in the Corps I carried a Puma or Buck lock blade, a Gerber MKII and a K-Bar along with the issued bayonet. When I started working I went back to carrying a stockman and a lock blade in a belt pouch. I eventually moved to a SpiderCo because I could open it one handed and that was needed at times. A work buddy tried opening a folder using his teeth once and the blade slipped and closed on his lip. He still has the scar.
When Kershaw came out with the flipper assisted opening blade I got one and used it and a short "electricians knife" until I retired. The electricians knife is a short fixed sheepsfoot blade. It replaced the lock blade and was a much better choice for EDC.
Today I carry a Boker Tree Brand stockman, a Victorinox mini Swiss army with a bottle opener, scissors etc and a fold-up credit card knife in my wallet. There is a local maker that has made several knives for me and I have toyed with the idea of a fixed blade EDC. I haven't seen a sheath design that accommodates concealed pocket carry and allows the knife to be drawn without removing the entire rig. That would be a good choice if someone comes up with a sheath like that.