I have driven all 3 vehicles, new 6th Gen City, 1.6 Altis and Toyota Yaris as a test drive, I would comment that City has stiff suspension and feel of a small car same as KIA Picanto or FAW V2 but definitely better than new Shape Cultus,
Yaris on the other hand has very soft suspension, seats are soft and comfortable and same bucket style as Toyota Altis, suspension is even softer than Altis so at low speeds and cities where roads are broken and not properly maintained which most of cities of Pakistan have Yaris is most comfortable to drive. Altis being another segment, i,e bigger size and bigger tyres is best in terms of motorway drive as well as village roads with no roads at all, as its suspension is slightly harder than Yaris so we can can easily call Altis a compact SUV Sedan 
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so far Yaris users saying that stability is not good at motorway but I think its may be due to smaller tyres with soft suspension, so if one can afford changing tyres and opting for broder tyres right after delivery its ride quality and road grip should definitely improve near to signature Toyota's.
I have also seen Pakgear Youtube channel and its review on Altis as well, so far Pakgear doing very Quality content but I think this Guy seems to be a user of Big sized cars so his view point about Yaris definitely cannot be totally Unbaised bcz Yaris cabin is smaller than a regular Sedan.
