Best investment ever in Swgoh?

In lieu of the upcoming changes to characters I've been thinking about what the best unit in the history of swgoh is to have invested in? I'm going with Hounds Tooth. It was unbeatable when it first came out, it currently can make any team viable in fleet arena, and it looks like it's going to be part of the core for the next Meta fleet. It's been around longer than any GL or Meta in arena, it has a decent pilot that you don't feel bad gearing up, and it can be used as a solo destroyer of fleets when coupled with Thrawn in GAC. Is there another character that you think has been a better investment?