I'm sure this has been asked plenty of times on this forum, but here we go again.
This is a hard one for me. Because, there's favourite hidden gems like Popolocrois that come to my mind. I also love what games I've played in the DQ series.
Without having to think about it too much it'd be FFVII overall. That game just did so many things right in my opinion. This is coming from the guy who only played it for the first time last year by the way. :P It has the best initial setup/introduction I've ever experienced. The stuff in Midgar was great. Pure excitement. Just a fantastic game overall.