...more likely to be subject to personal review by Google
You should build your site so that it can survive a personal review by Google.
If you have any success in the SERPS in a competitive field, you can bet that the competition will report you for spamming [google.com]. You need to be able to survive that.
Originally the schema naively intended that .com was commercial, .net was a system site (ISP, web host), .org was a non commercial organization, .edu was an educational institution.
But since these extensions are not regulated the designations are only roughly followed and may not be accurate. Only .gov and .mil are regulated.
I think .com is still the most desirable for many reasons even if your site is not technically commercial and will probably do best with Google (if there is truly a difference). I don't think any extension will by itself provoke a review by Google unless it is some obscure extension using some well known domain fraudulantly, like google.xyz for instance--that's an opinion.
Thanks again for your replies.