I have owned Hitec and Futaba for many years. Both have proven as reliable as cheap electronics can be. I have never heard of anyone having problems with JR or Airtronics.
BTW, the ONLY servos I ever had fail in normal use were both high dollar Futaba coreless models. One just quit responding and the other went full clockwise and stuck. Both after a very short time. I still have some RCD-5s from over 10 years ago.