457 plans generally allow penalty free withdrawals as soon as you leave the job. that's the big advantage over the 403b.
Remember, you can contribute to both a 457 and a 403b, it's not an either or thing.
OCCUPY ER, <=>
"The needs of the many outweigh the needs of the few, or the one." - Spock
Retired Mar 2014 at age 52
Target AA: 70% equity funds / 28% TIAA-Traditional/ 2% cash
Target WR: 0.0%,
Income from pension, rent, and eventually SS