which "better": com dll customary dll typelib?

i put "better" quotes since it's qualitative question. i've minute com dlls integrate years have wholly recently upon, successfully used, customary dll typelib concept.

are there any compelled reasons com dlls instead dll+typelib? granted, can't dcom dll+typelib, nonetheless wholly reason?

edit i've combined com dlls visible c/c++ 6, compaq visible fortran, delphi, visible simple 6, activestate perl few others. i've combined customary dlls visible c/c++ 6, delphi, ada few others. i've combined typelibs possess customary dlls also third jubilee dlls. doubt creatively combined context delphi dll+typelib reimplementation vb6 original.