The answer depends on what type of surfaces you need to disinfect. Both methods use pressure to create aerosol droplets. With the ULV fogger, these droplets fall by gravity onto surfaces. However, with electrostatic sprayers the droplets become charged particles as they leave the sprayer. So instead of just falling onto surfaces, the droplets repel from each other and cling to the opposite charges on the surrounding surfaces. This causes the disinfectant to “wrap around” and cling to the entire surface. If you have surfaces like cans or gym equipment, the electrostatic sprayer will be more effective in covering all sides.