From when I start read watch forum until now, eta vs in-house topic never stop... I realize that the only difference of the eta vs in-house it is $$!
Eta = easier to service means cheap
In-house = must return to them for the service means expensive
Accuracy = both also can get cosc
Like some brand they no have cosc doesn't means bo chun, my IWC eta7750 4 mths slow 35 seconds, last time I check -1s per day.
So from now what I see, how much budget will u like to spend, if u really love the design u won't bother the movement, if u have extra just go in-house, take in-house like a brand respect, but if u don't want to spend too much just go with eta.
Just like me, poor guy so choose IWC eta7750 (don't laugh, it is true)