Servos failing, hmmmm? You can always find examples, regardless of brand.
Personally I'm on the KO band wagon. I cant argue for it, it's just a feeling of getting better quality. Maybe it's like with cars and women, you cant really argue about why you choose like you do...
I'm also an budget guy, so every time I buy some electronics, I compare to the Hitec value-for-money-index (cant really go wrong with it). So in addition to my KO stuff, I also got some Hitec.
From the rational and statistic point of view: Let's assume that most manufacturers got around 2-3 % servos, that fails. Now, if Hitec due to pricing sells 5 times as much than the others, well, it's easier to find those examples....