First, Hot-Rox contains Carbolin-19, so keep that in mind.
Read this article for some additional info on Carbolin-19: https://www.t-nation.com/supplements/burn-fat-pile-on-muscle-with-forskolin
Now check out the <a href="http://www.t-nation.com/store/products/hot-rox-extreme"target=“new”>HOT-ROX store page and note the additional ingredients.
So, in short, you’d use Hot-Rox for shorter periods when you’re fat-loss focused and want an extra boost. Hot-Rox contains stimulants plus other ingredients, so it’s more of a dedicated fat burner and the Carbolin is added to help you retain muscle when dieting hard.
You’d use Carbolin-19 more long-term for any goal since it has fat loss and muscle-building properties. It’s also not a stimulant or at least very mild compared to Hot-Rox, and some want the fat loss effects without the stimulants.