Wemay, what is your goal? Do you want to run those engines for 300,000 miles? Maybe a higher quality oil is worth the money, and maybe not. Get a different car in 80,000 - 100,000 miles? No point in a different oil. What is the warranty on those? Currently Hyundai/Kia offers 10 years or 100,000 miles on the powertrain to the original owner, using the recommended oil and recommended oil drain intervals. If their money is backing that, that means something significant.
So, if you really want to upgrade the oil, use a top quality syn 10W-30 (in your climate) in the 2.4 for the full oil drain recommendation, and a top quality 5W-40 European-spec gasoline engine oil in the 2.0T for the full interval. Kendall, Pennz, and others make top 5W-40 and 0W-40 gas engine oils.
Or use the cheapest oil that adequately meets the spec and cut the drain intervals in half. If fuel dilution is your concern, a top oil and a cheap oil are equally poor when diluted.