Welcome aboard,
You may not find a lot of help here. Not many are into industrials. There is a FB group for industrials ( vintage?) that may be able to help you more. Having a good definition of what you sew is very important to choosing a machine. Some industrials are made for tailoring at very high speed, and not so good at leather. And the weight and layers of your leather will make a ton of difference.
older industrial have motors that continually run at high speed and your foot engages a clutch when you want it to stitch. Newer ones use servo motors that are controlled more like home machines. I took an Singer 31-20 to my GF. She had been sewing for 6 decades. When I fired up the motor and the lights dimmed she got nervous. One very quick seam and she was done with it.
Had to put the toy 20 by it just for fun and scale.
Learn a lot, and then choose wisely.