There are a lot of variables to consider for this question. I use a mix of Hitec (7950, 7954, 7955) and Savox (1270, 2270, 1256). If I need to get some for a new build, I now lean towards Savox. For the price and reliability, I don't think you can beat Savox. I was going to try solar servos, but I have read some not so good things about the longevity and reliability of them, so I will stick with what I know works.