I'm working on optimizing my display campaign targeting with "Interests&remarketing".
I would like to know, which ones are the best for targeting and how do they select different users for Affinity audiences, In-market audiences and other audiences. For example, I can select Property from both Other audiences and In-market audiences. How are they different?
Re: Display targeting
IMO, all three audiences have different aim and can be tried and tested separately so that you get an idea of which one's work best for your business website.
For example affinity audiences is primarily for Reach and you could enhance your Brand name using this category. Similarly, the second one i.e. In-market audiences are those users who are browsing and looking for the products/services like the way you are offering. This might help in improving your ROI.
I would suggest you to reach this help center reference for more details: https://support.google.com/adwords/answer/2497941?hl=en
Let us know if that helps!