Google/SEs and linklist category pages...

[LD]

I noticed that linklist with seperate category pages usually have something like:

domain.com/linklistdirectory/asian.html

and a different html page for each cat.

but some have

domain.com/asiandirectory/index.html

putting an index page inside folders created for each category.

Is there an advantage to one or the other...does an index page get any special treatment?

Just wondering...