Marathon Training...Which Plan?

I am in the process of picking my marathon training program but am not sure which one to choose.

There is Hal Higdon's, which only tops out at 20 miles as my longest run and is 18 weeks long.

http://www.halhigdon.com/marathon/inter1.html
http://www.halhigdon.com/marathon/inter2.html

Or Cool Running, which tops out at 26 miles and is 20 weeks long.

http://www.coolrunning.com/engine/2/2_4/128.shtml

Which would you choose and why?