MutableMesh Questions

i want to make body types normal, big, fat

i could do it with using 3 diffrent body models

but i think i can do it in morph target, but it is for npc so there could be many of them possible

if i use morph target in mutable mesh, does it make game go slower than just switching 3 body types?

i know there is experimental plugin that can add morph target into skeletal mesh
it is called Skeletal Mesh Morph target Editting tool

so do you recommend using it for many npcs?