I compared 5 different jars of molasses and I noticed grandmas is the best because. (aka this is what you want to look for on the nutrient label) Idk on a scientific level what these elements do but they're good for plants.
Most important is the unsulphured factor. Sulphured anything going into a plant can cause salt deposits(not to be mistaken with sodium or the nutrient form of sulphur)
This was proven when Penn State University conducted a test watering a plant with PH balanced propel, gatorade, and various vitamin waters(including but not restricted to the brand vitamin water)
Grandmas contains outright potassium this will help the carb most off brands do not say potassium on the label.
It also has a good balance of calcium and iron at 4% plus alittle magnesium 2% Off brands usually have a 10% 2% calcium/iron ratio with either of them being the higher one
Personally if i had a choice Id take the higher calcium because it takes forever to move through the plant but neways.
So from a 'plants' point of view, grandmas is the most complete.