I would always opt for a SERM and if you want to run an OTC product like AlphaMax XT or Sup3r PCT, that could help. A SERM is the foundation of PCT IMO. In addition to an AI, AlphaMax XT contains a variety of beneficial ingredients that can be helpful during PCT.
It contains a full dose of Ashwagandha, which is most known and used for reducing cortisol and helping with stress and anxiety, but there are also studies showing it can improve muscle mass, strength, and endurance, which is beneficial at any time.
It also contains a full dose of tongkat Ali, another adaptogen that can help optimize hormone levels and balance. Tongkat can also improve libido, which is always nice. I find the combination of tongkat and Ashwagandha provides a subtle but valuable mood elevation and reduction in stress/anxiety.
AlphaMax XT also contains a full dose of ferulic acid, which has been shown to improve mass and strength, which is valuable any time.