I crimp multi-strand when the terminal is a screw that rotates as it is tightened down onto the conductor. Too often a few strands get cut by the rotating screw, or they move sideways from under the screw and the screw then does not put any pressure on them. Some 13 amp plugs especially.
Partex CEFT 1 is very good economically priced crimper for bootlace ferrules
https://www.rapidonline.com/partex-ceft1-bootlace-ferrule-crimping-tool-85-0275
Partex CEFT 1 is very good economically priced crimper for bootlace ferrules
https://www.rapidonline.com/partex-ceft1-bootlace-ferrule-crimping-tool-85-0275