ORIGINAL: barracudahockey
Analog servos use less power but develop their peak torque after some movement, 10 degrees or so if I remember right.
Digitals center better, develop their peak torque immediately (less than 1 degree rotation) and hold thier position better but use more power (drain the battery faster) Will you notice a difference? Yes. Will it be worth the price difference, especially on that size plane? That choice is yours.
Digital servos are better than analog but they are not that good.
I have tested about 28 servos both digital an analog. (actually they are both analog servos but the name digital seems to have stuck).
Usually the analog takes about 15 degrees to develop its maximum torque while the digital takes about 1/2 that. The best servos I have tested is the Futaba 9152 and the Hitec 5995. They both take about 4 degrees to develop maximum torque.