I prefer to use DBCC ShowContig and utilize the following criteria as to rebuild or reorganize.
On indexes with more than 10,000 pages
Rebuild when Logical Scan is 20% or higher
Please note that Index rebuilding process uses more CPU and it locks the database resources.
Chris Powell
George: You're kidding.
Elroy: Nope.
George: Then lie to me and say you're kidding.