Hard to illustrate without feeling them since the only difference really is the material (the sizing is ever so slightly different but I think mainly the sleeves are shorter on the sheep and then the other fit differences are just from the thickness/pliability of the material).
As you’ll see when you get your steer, it’s pretty beefy. Total tank that will last forever. The sheep skin is more akin to regular suede. Definitely well made and not something you need to baby but I don’t think it’s something I would be able to just absent mindedly wear without being conscious of taking care of it either. Whether that’s the rain, spilled drinks on a bar table, or dirt/grime.
The steer also has a bit more of a shape/structure to it due to the leather, whereas the suede will be softer/more like a shirt jacket in drape. I think the difference here is purely a matter of preference, with the steer definitely more befitting of the biker/trucker aesthetic. I also think the steer will soften and wear in quite a bit over time and only improve with age but the suede might just stay as is for better or worse.