If you buy from Lippert, I assume you'd get a generic offshore part from their usual source. Considering the potential consequences if a seal fails, I'd want to install a top quality brand. All 4 brakes in our TT had to be totally rebuilt under warranty at only 7 months old due to contamination from grease so I wouldn't trust what the TT axle manufacturers use.
Not sure what the best brand names in seals and bearings are. If it's not made in Japan, Europe or North America, I wouldn't want them. The owner of frame & axle shop told me once that the best one is made in Japan but can't recall the name.