Which self leveling system is better, servo motor or compensated?

Each system has its pluses and minuses. Servo systems have the appeal of driving the laser to level without the operator turning leveling screws. However, a compensated self leveling laser can be up and running just as fast as a servo system. Servo systems are more complex electronically, draw more power, and have been more prone to drift with temperature change. Well designed servo systems and compensated systems both provide accurate and reliable results. For grade checking and concrete work, compensated systems have been the mainstay for many years. If the laser is going to be used in a situation where it is inconvenient to turn leveling screws, (up on a 14' tripod for machine control), a servo system would be preferable.  more