Motor oil Auris E18 2015 1,2T

Hi. Just bought Auris 1,2T 2015 version model. Manual says, use 0W-20 motor Oil. If 0W-20 is not available, use 5W-30.

But after use 5W-30, change to 0W-20. How can I know if 30€ 0W-20 is good than 70€ 0W-20? Shell, Mobil 1, Castrol? This car is not hybrid.