When it comes to describing something as "second-best", this often implies that it is inferior to something else. However, this term can come across as negative and dismissive. So, if you're looking for synonyms to describe something that is not the best but still has value, you may consider terms such as "runner-up", "close second", "next in line", "substitute", "alternate", "backup", "second-choice", or "second-in-command". These terms may carry a more positive connotation, highlighting that they are still valuable and capable options, even if they are not the absolute best.