Dave, it's impossible to explain in short. and anyway...
Sporasub has no more any relation at all with old Sporasub you used to know till a couple years ago. Till a couple years ago, the Sporasub brand belonged to the multinational Head/Htm, that owned (and still owns) the Mares and Dacor brands too.
At one point, a couple years ago, the Head/Htm group dumped the Sporasub brand, as they felt they didn't need two brands for the same type of products and the same target category (i.e. Mares and the old Sporasub).
That's when Omer came with a good idea: they bought the brand Sporasub (but only the brand, not the product line) and started a totally new line of new products under the resuscitated Sporasub label.
Now Sporasub is the luxury brand of Omer (same as Lexus for Toyota or Ferrari for Fiat) for wetsuits, fins, mask and accessories of superior quality and advanced design(suppossed to be, at least).
The One brand, instead, is a new luxury brand of Omer for bandguns: indeed the One speargun is a luxury version of Omer Caymans (stronger build, more metal parts rather than plastic, better shaft, better reel et cetera).
Nothing to do anymore with the older Sporasub products.