bbellfly.... I don't use Fataba..... So maybe I should not have post.....
But IMO...... (It's not worth much)... Anytime you can get "better" equip...
Go for it..... It may not be really needed on a certain plane... But you can
always use it later... Well that is if you stay in this great hobby.....

Digi's usually mean better centering, and over all better perfornance, with
a bit more battery usage.....

On the throttle.... If all is adjusted good, almost any servo will work great..
I think on the throttle... IMO... weight needed is of the greatest concern...
I would say besides the throttle, the Ails. would need the least speed/power
from the Elv/Rud..... Remember all the above is JMO......