9 speed is my wife’s hybrid, not one I use. We had set it up for the turbo but after 5 months i think she had used it 3 times.
Am not sure about zwift, I enjoy isolation too much, so not convinced I’d rather be sweating with virtual company than my current TrainerRoad and Netflix lifestyle.
will you ever use it non-ERG i.e zwift and other stuff
if so stick with double and there are non-shimano double chainrings you can buy
also what about the 'other' bike (9 speed?)