For simplicity let’s put auto opening and assisted opening in the same category as folding due to moving parts.
Which do you prefer and why?
For me, i prefer fixed. There are no moving parts that can be broken easier than the rest of the knife. The handles tend to be more comfortable. Fixed blades from reputable manufacturers made with quality steel will hold up to a lot. Knives are our biggest survival tool, you can do an awful lot with just a knife. From self defense to building shelter or a fire.