First of all, make sure you are running your ATV or rates or whatever high enough that you are using most of the throw the servo can provide. Use the linkage geometry to get the actual surface throw where you need it. On my JR I set the throws at least 125%
If you are using pull/pull you will need a bellcrank setup to accomplish this.
Digitals will always be much better resolution, but good coreless non-digitals are good too.
It looks like many affordable digitals are coming our way!
I think digitals will be the only thing available in a few years.