10) e is less challenging to spell than pi
     9) e ~=2.718281828459045, which can be easily
         memorized to its billionth place, whereas
         pi needs "skills" to be memorized
     8) The character for "e" is so cheap that it can be
         found on a keyboard, but pi is
         special (it's under "special symbols" in word
         processor programs)
     7) Pi is the bigger piece of pie
     6) e has an easy limit definition and infinite series;
         the limit definition of pi and the infinite
         series are much harder.
     5) With e you understand what it is even though
         you start learning it late when you are in
         pre-calculus, but pi, even after five or six years
         it's still hard to know what it really is
     4) People mistakenly confuse Euler's Number (e)
         with Euler's Constant (gamma). There is no
         confusion with the one and only pi
     3) e is named after a person, but pi stands for itself
     2) Pi is much shorter and easier to say than "Euler's Number"

              And the number one reason why e is inferior to pi is...
    1) To read pi, you don't have to know that Euler's name is really pronounced Oiler.

...credited to feldco#NoSpam.aol.com, whoever that may be