Would the first servo be a Blue bird servo?
If so I'd say go with that one, I use the 631mg one in a touring car and it's a great servo, sure it's not digital but for the price I can't fault it.
Have been using the blue bird servo for over a year now and I really cant tell the difference in speed & torque between it and my Savox 1251MG digital servo.
Cheers
Rob.