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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-
Have even seen it suggested that some Sellitas actually are ETA kits, merely assembled by Sellita.
Selita literally made movements for ETA for decades, they are part of ETA's heritage.
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.
This is possibly true, I have a couple of noiser Selita movements but they are just base movements with no improvements. ETA movements aren't the quietest in their base form either. When I learned to service the 2824, I was really suprised at how "unfinished" the movements was side by side with a manufacturer modified one. It takes a lot of work to get an ETA movement to look good enough to have a display back case, and a mountain of work to add common enhancements.
In any case, fuck it, Eterna invented the bearing rotor and do it better than anybody imho and they use Selita as a base movement if my memory serves me correctly.
Stonehedge
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.