Hello there! The question as to which method is easier is an open one. Pythagoras theorem will always get you the answer, and it is a no-brainer. However, it can be tedious and tiring to use if the coordinates involved are complicated.

Comparing coordinates is easy if the numbers are nice and if a simple diagram is needed, like in this case.

For this question, comparing coordinates is defintely easier. Hope this helps. Regards