Help choosing a servo motor
Servos are digital by definition.  All you have there is two sellers that are selling the same product, but they are describing them slightly differently.  They are both SG90 servos. They are both digital (they require a digital PWM signal to control them, hence they are digital).

However, here's a little hint: Add the postage costs on to the cost of the servo - you'll see there's not that much difference in price - only 3 rupees between them.  That's about ¢5 or 3p.