A lot of data out there on which one is better, looks like it all comes back to how much you want to spend, $20, $40…… I’ve never tried the Corona brand before, mid range price so we might see how they go. I have the bench test unit, so I can run them through that first to make sure all is well. Decided on the Corona DS 239mg Digital. @ 4.6kg with 4.8v they should be fine as aileron and flap servos.