both is the same on parts, price, service. parts is available not an issue.
cerato and elantra do share some parts too.

better get higher cc other than 1.6.
these are heavy cars and 1.6 doesn't save that much fuel compared to 1.8 or 2.0

im elantra 1.8 owner, not much complaint / major issue other than wear & tear. replaced the whole cooling system hoses and engine gasket due to previous owner fill in tap water into the coolant.