I carry folders with me all the time, including a multi-tool. But when i really think I might need a knife itself, I'd prefer to have a fixed blade hanging on my belt. When I went to sea, carrying a fixed blade in asheath was a fineable offense (old regulation to keep sailors for killing each other). I still carried one. It was much nicer to be able to just reach for it and pull it out ready to go. I really like the strength of a fixed balde and the ease of operation.

I carry the multi-tool all the time, but I also usually EDC another cheap folder that has only one blade. When I need to pull a blade and cut something, it's much nicer to pull out that cheap folder than to have to fiddle to find the right blade in my multi-tool.