Which is the "best" way to create/edit a mod in Civ IV? v2

[CivRules07]

the title says it all. here's the details on what i mean by each of the options:

WorldBuilder: includes using the in-game WorldBuilder and editing the WBS file
XML: copying XML and building a mod by editing the XML
Python: creating scripts, etc. using Python
DLL: editing the DLL files
it depends: it simply depends on what you're trying to accomplish. if you vote for this, i'd love it if u elaborated a little more in a post
idk and idc: u aren't sure, you don't care, or u just aren't a modder

i'd love it if u posted when u vote so i can get an idea of why u voted the way u did