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I don't know dude, I have yet to find a watchmaker who considers the Selita SW200 inferior to the ETA 2824 or the SW300 inferior to the ETA 2892.
Well, i'm sure supply is a really big part of it. But if there is a preference for ETA over Selita, it is consumer driven based on marketing and not based on specification or quality. I mean, all Selita movements can come with a COSC certificate if you go for Elaboree grade.
Its all down to the fact that Swatch group want to provide movements to their own brands. Nothing more, nothing less.
Stonehedge-
Yeah, tbf I don't think there's much of a difference, it probably is marketing/brand perception more than anything. Have even seen it suggested that some Sellitas actually are ETA kits, merely assembled by Sellita.
You do read about the rotor bearings being noisier and/or less reliable on the Sellita autos, and that's one part that does look visibly different from what I've seen. I'm no expert or watchmaker though, obvs.
Regal
Watch brands only use Sellita when they can’t get ETA. That’s all you need to know.
Up to the consumer to decide where the value is in a watch. I do think two grand is pushing it a bit for anything with a Sellita in. That U50 is definitely on the pricey side.