DA, TF, DR or Combo?

Domain Authority, Trust Flow or Domain Rank...
I know. I know. ALL the metrics can be called out with silly anomalies and many times most of them dont make sense in a comparison. I also know that none of them equate to actual rankings.
All of that aside, which one (or others) do you put most trust into and are there certain minimums from each that you look for?

None

For what purpose? For guest posts you check DA and spam score.
For expired domains TF, spam score and linking domains.

For what? Buying expired domains? For backlinks?