DDM bulbs aren't great, but they have a good warranty and it's no questions asked. That makes up for the lack of quality control in initial shipment. If you get a good set, they'll last for a long time. If you get a bad set, well they'll replace them and the 2nd set should be fine.
If you get Morimoto's, they'll have done more inspection before initial shipment so the chances of getting a bad set are much smaller. But if something does go wrong, TRS has a few more hoops to deal with. Both companies bulbs are made in China, both just buy containers of bulbs from China. Neither really makes anything, they go to trade shows and negotiate contracts. Note that most aftermarket light products -bulbs, angel eyes, led's - all look very similar but in different packaging.