Thank you very much for thids it is really helpful.It’s really hard to say whether these examples show challenge. Ultimately it’s not the “example” itself that showcases this, it is more how you describe the actions you undertake to get through the example that will demonstrate challenge.
Therefore either example could be great examples to use - but it’s down to your experiences rather than the “title”.
For example, I was interviewing two people on the same day. Asked a very similar question to both candidates - one candidate talked about running a marathon while another talked about running a 5km charity run. Everyone assumes the marathon runner had the best example, because surely a marathon is more challenging that a 5km run, right? In reality the 5km run person had the much stronger answer - the marathon runner was a distance runner already, they loved running, they just upped their training a bit. While the 5km runner hated running, was very unfit, had bad eating habits, and had to persevere a lot to just be in a situation where they could complete the run.
Also great example and agreed.