Now, the naming only matters if the vendor does not change the Kratom name or designation established by the original farmer to something inane without any meaning or logic to it, such is usually the case. However, not all vendors succumb to marketing and low respect for their customers. Botanical Bunny for example sticks to the original farmer names and designations.
So, based on my own experience and research, this is how it goes: 
MaengDa (MD) -- Older, more mature and larger leaves, sometimes Wild species, with a naturally higher alkaloid contents. Premium -- High quality, mid canopy foliage exposed to minimum sun bleaching, much finer grind, provides more robust effects. Super -- The stem and vein is extracted from the foliage prior to processing, increasing the potency of the final product.Now, a product can have more than one designation, it just means that it combines several of the above mentioned factors.
For example, Premium MD is a mid canopy leaf with finer grind which comes from an older wild tree with higher alkaloids.
The same with the Plantation MD designation, it would obviously be farm grown rather than the wild species with fewer alkaloids due to soil depletion. Super MD would come from an older plant, possibly wild without any stem or vein in, providing a different more speedier experience.
Theoretically, while I am personally yet to see it, a leaf can carry all 3 main designations of Premium, Super and MD simultaneously.
That leaf would be first, from older trees with larger leaves (MD), second, collected from the best quality spot of the mid canopy foliage and very finely ground (Premium), and finally third, having no vein and stem, giving it the Super designation.*
*Just a side note, the stem and vein of the plant has much fewer alkaloids so a Super designation requires a dose reduction to achieve the same effects.I have given it much thought, and it all adds up.
While I am certain that there is MUCH more to it than this, it is a good start.
I have been using my designation chart for my own picks with much success, just wanted to share it.
If we understand what each name really means, we have a much better chance of picking the "strain" with the specific effects that we seek from this plant.
Let us open a discussion about this so that we can make better Kratom buying decisions!
