I recently returned to building a 2m patternship, after a few years off.

I use to have an Aresti III, and I use to run the following servos.

Futaba S9102 on the wings
Futaba S9202 on the Rudder
Futaba S9101 on the elevators (2)

I have now started looking at the digital servos, and it seems such a mine field out there.

What are the main pros and cons of going Digital?
There seems to be Digital, and Digital coreless? Which is better?

As I am on a rather tight budget, I was looking at using something in the Hitec range, as i have had good experiences with Hitec.
HS-5625MG for rudder and ailerons.
HS-5245MG for Elevators?

How much MORE battery capacity do I need, if any, using Digital versus my older coreless setup?

I use to happily use a 1100Ma 6v battery, that would easily last a whole weekend of competition.

Thanks in advance, Bruce T