I checked both cars today. Picanto auto delivery end of October if booked today.
Saga November delivery.
Saga cbu model quality is genuinely good for the price. Overall, if saga ckd quality turns out to be as good as the cbu, and you don't mind the longer body, I would go for the Saga. Picanto interior quality feels better. But it's a smaller interior and smaller engine. Both run the exact same Hyundai 4 gear autogear box. Saga will have more power.
Right now though, in my opinion it's impossible to go for saga as we don't know what the build quality will Be