Anyway, back to ETA vs X: I think the question is more like whether it's worth paying 900-1500 for a base ETA over 3-500 for Miyota, if everything else is equal.
Emotionally, I'm quite drawn to the reliable universality of ETA, and that its humble standard is trusted by many much more expensive makers. But I wonder, do they also choose it more because of the consistent "Swiss made" brand?
At that price proposition, I'd pick Miyota. ETA wouldn't be "double" so good. Example: I have a ETA Tissot (at about 450€) and a 7750 Chrono (at about 700€). I did look into the 500€ Autodromo with Miyota but decided to skip, not mostly because of movement but because it lacked differentiation at that price. At 250€ I'd probably have given it a go just for fun. Original Black Bays at 2k€ with ETA, sorry but no, then you need something more interesting.