Turning down an interview

[NotAGolf]

A couple of days ago I was invited for an interview at a new company.

After finding out more about the role, and having been offered another role in the interim, I no longer want the job.

Do I:
A) Cancel the interview now.
B) Take the interview any and pull out later on (if successful)

Normally I'd go for option a) to avoid wasting my time and theirs. The thing I'm not sure about is I might want to work for this company at a later date, so I don't want to to damage my reputation. Which option would you go for?

For option b) I feel like I'd be wasting their time if I proceed, but if I was successful then perhaps I'd be 'on their radar' for future roles. But on the flip side, if I balls up the interview then maybe they wouldn't consider me in future.

 

[NotAGolf]

Thanks for the feedback all. A brief update: I went for option a) in the end.

For context, the reason I turned it down was that both positions were advertised as a senior role, but one involved lots of line management responsibilities, whereas the other had none. Neither mentioned this in the job spec. I was honest with them and said that I'd rather a more hands on role, and seeing as the salary was the same for both roles, it was a no-brainer for me (I didn't tell them about the last part).