I have never turned eggs by hand. I depend upon my incubators for turning the eggs. I work and am away from home at least 13 hours a day (90 minute commute each way and a 10 hour work day with an hour lunch break) so I need the auto-turning features.
Therefore, I have no comparison about the difference in hatch rates. I just happen to like not being bothered to turn eggs, the incubators stay closed until or if I candle eggs, and I have two styles of incubators; one has eggs on their sides and the other holds the eggs upright. The former only holds 7 eggs and the latter holds up to 20 to 24 eggs. I have three of each style. Never checked the hatch rate, because the numbers of eggs are so different. (Not too good with math, y'see.)
I want to touch the eggs as little as possible.
Therefore, I have no comparison about the difference in hatch rates. I just happen to like not being bothered to turn eggs, the incubators stay closed until or if I candle eggs, and I have two styles of incubators; one has eggs on their sides and the other holds the eggs upright. The former only holds 7 eggs and the latter holds up to 20 to 24 eggs. I have three of each style. Never checked the hatch rate, because the numbers of eggs are so different. (Not too good with math, y'see.)
I want to touch the eggs as little as possible.