I was thiniking the same, as I too am intersted by these 2 watches, and not a little, but VERY interested!
I know very few things about G.O.
So I won't be able to answer to your question about the GO Caliber 100.
As for the Blancpain, the only thing I know is positive, as it's an inhouse movement, nicely built, and with a 5 Days Power Reserve which speaks a lot to me.
The GO seems also to be an in house movement, and nice too, but if some experts here may answer , it will be very kind....Pleaaase.
Best.
Nicolas