Selection of agitator for reaction kettle

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I would like to ask the experts here: I currently have a reaction kettle equipped with two mixing motors, which are mainly used for synthesizing water-based polyurethanes; one of these motors is used for scraping the walls of the kettle. The motor has a power of 15 KW, and it is equipped with a reducer that allows for speed adjustment between 0 and 60 revolutions per minute. There is one main shaft used for stirring, of the impeller type. The motor for this purpose has a power of 11 KW. In the synthesis process, the oil phase is synthesized first, after which water is added. The frame and the main shaft are then started to stir, so that the oil phase and water mix evenly. At first, the viscosity will rise to 200,000 CPS, but it will later decrease. Once the mixture is well mixed, a homogenizer is used to further homogenize it. I would like to ask: should my main shaft be driven by a reducer that allows speeds from 0 to 60 revolutions per minute, or should I use an inverter to control the speed and achieve high-speed stirring? Which of these two methods is more effective in ensuring a more even mixing of the oil phase and water? Thank you!