I feel like the bottom hand is the dominant or power hand. As a right hander, when I hit a ball hard, I get most of the power from the right hand. The left hand is more for control and direction of the bat. Few times for fun I switched to left hand but I can't hit it far at all.
Maybe I did it all wrong over all these years. I hit like Tamim/Mushy but ball goes like Riyad
off topic - razab bhai er shathe ekta match khelte parle bhalo lagto. I played with Alfurqaan. The guy is build like Umesh Yadav but bowls like Farhad Reza and hit him out of the park quite a few times