7.1.x and 7.3.x are both short term releases. As such, they should generally only be considered when you require specific features they alone introduce. The current suggested release is 7.0.5 and most likely the next release of 7.2 (7.2.4 ca April/May) will also get the Gold Star designating it as suggested.
In general, I'd be conservative with rushing out to adopt new firewall and FMC releases unless you are encountering a specific bug, vulnerability or require features only available on newer releases. In your case, I would most likely advise waiting for 7.2.4 absent any additional information about your specific needs.
