I always suggest to use the last TF version as we just backport security fixes for a few releases.
Other kind of more or less “minor” bugs or missing features are not backported.
We have mainly an end of life “informal policy” on TF releases that It is related to the security support lifetime.
/cc @yarri-oss  @mihaimaruseac @thea   probably we can claim this a little bit more formally giving enought visibility on the website and github.
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Note that we mostly do patch releases for security reasons and each version of TensorFlow is supported for only 1 year after the release.