5V to 12V or 12V t0 5v

In my project I need 5 and 12V DC 2A Which will be more reliable a converter 5_>12V or a converter 12->5V?

Probably 12V to 5 V simply because the input current at 12V will be around 1A with a 12v to 5v buck regulator with 2A at 5V. Going the other way 5V to 12V 2A will need around 4.5A at 5V and a boost regulator.