Sensi Seeds bought and acquired White Label several years ago (along with Flying Dutchmen and some other Dutch breeders).
So White Label is now just one part of the Sensi family of breeders, thus their presence on the website.
As for are White Label Seeds as good as Sensi Seeds, I say no.
I've grown both brands (Sensi Jack Herer and White Label Rhino), and while Sensi was only mildly disappointing, White Label was extremely disappointing.
I would grow Sensi again, but I will not be growing with White Label again.
The majority of White Label's seed catalog is made up of knock-off strains, but they do have a couple of originals.
Now if you're wondering if you should buy either of these brands, don't.
There are better breeders/seeds/strains out there then White Label's (like TGA Subcool, Gage Green, Mandala, Sannies) that don't cost an arm and a leg.
Now speaking of costing an arm and a leg, their are better seeds out there for the price then what Sensi is offering (like Cali Connection, DNA Genetics, and TGA Subcool).
I still like Sensi and their gear, they just charge too much for it.