Dont know if you made up your mind on blade choice yet, but I am going to go against the grain and say that the TSC landpride is going to be just fine for your machine. Which, as you already know, is a lighter and smaller scut. Even in dirt, I dont think your tractor will hurt a TSC blade.
OTOH, I dont think I would buy either new. Shop c-list for a used 60" blade. Light duty (but heavier than the KK) blades from a few decades ago can be had for under $100, and have a ton of life left. And even if you do manage to tear it up, (which I doubt), you aint out much money. Your tractor is about the smallest they make, so even a cheap blade should hold up fine short of going top speed with it and catching something solid.