Chrono Trigger is pretty great, but for me it has to be FFVI. The soundtrack elevates the characters to such a high degree and the gameplay with the ensemble cast complements the themes of the plot perfectly.
I dont mean to plug my stuff, but I’ve made a video about the genius of FFVI in my youtube channel where I explain exactly why I think it’s one of the best games ever, if anyone is interested, check it out.

Btw, if plugging my channel is against the rules, let me know and I’ll edit it out

My FFVI analysis:

My Shadow of the Colossus analysis: