I don’t care about story and probably won’t replay a title, what’s the best JRPG?

I’m mostly looking for mechanically complex and difficult! Fantasy + team management is a must as well. I love RPG’s that let me mess with niche, expansive and/or complex build/leveling systems, but I’m not sure if this aspect translates to JRPG’s too much! I have very little familiarity with the genre, feel free to suggest obvious ones! I have a feeling more modern JRPG’s will suite my tastes more, but if there are older ones that you think I’d love please suggest it! This is for Steam