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Yes, the Longman series has more material than the ETS "Official Guide" (put out by McGraw-Hill). Unfortunately, though, it is also far less accurate. Many parts of the Longman integrated speaking and writing sections do NOT match the actual material on the iBT, which is why I never use that book in coaching students.
My personal favorite is "The Complete Guide to the TOEFL -- iBT Edition" by Bruce Rogers. It has more material than the Longman (800 pages plus 13 audio CDs), and it is very close to the real test material. I also appreciate the format of the book -- the author includes a separate chapter (lesson) on each individual skill. For example, there are six separate speaking chapters (one for each task) and eigh separate reading chapters (to cover the 10 types of reading questions). There are also preview and review tests as well as full tests in the back.
I do occasionally use the Barron's 12th edition and the Delta series. Again, though, both of these books have sections that do NOT match the actual test, so as a teacher you must be aware of this and pick and choose which tasks you include (or omit).