I doubt that even "the best" of breed DST is all around better that its opponents. Maybe it is a better idea to discuss what is the best application for a particular user profile.
Mine looks like that:
1. free software
2. able to index usual file types and mail(Outlook mainly)
3. able to index web sites
4. able to index network mapped drives
5. able to handle vast amounts of documents, both as number and size
6. (very) short learning time
7. the possibility to use the computer all the time(X1/Copernic users know what I am talking about...)
I found all the above and more:
8. client - server(excellent for LAN/ corporate use)
9. Boolean syntax supported, proximity/fuzzy search included
10. Open source/ OS independent(more or less)
11. superb visual display of the results
in one marvelous product called AutoFocus, more info you can find at ADUNA
Prior to AutoFocus I use to regard X1 as "THE DTS" of choice...not the case anymore...since 2005 I use AutoFocus on a daily basis for my 110.000(+/-)documents/~80GB hosted both on my HDD and network locations.
BTW, Yahoo DTS had a beta version that could index mapped network drives...and that was working nice for me but after one upgrade I was bitterly disappointed to notice that the feature is no longer available for the free version but only in the commercial version of X1 - and that is how I stared to dig for a new DTS software . Does anyone had a similar experience?
What can I say more? That AutoFocus is not the best of the best, file preview and the ability to index within archives is still under development but certainly it is THE BEST for me.