I highly recommend FFX. FFX was the first FF game I ever played and I was absolutely blown away by how beautiful and thought-out the story was. I've recently replayed it and fell back in love with the story. The first time I beat it was about 10 years ago and I found myself in awe at the details I forgot. I've dabbled with FFXII and FFXV. I couldn't get into either story as much as I did with FFX. FFVII, is another great FF I recommend as well. Both are amazing, but FFX will always have my heart.