For me, it’s one of two choices:
Final Fantasy VIII - It’s one of my favourite entries in the series and think they’ve ignored it far too much over the years. There’s a lot they could do with it, not just visually, but with the story and mechanics too.
Final Fantasy Tactics - This game is just fantastic all round, and I can’t say any more than that.
What would you choose?
I’ll second Final Fantasy VIII for a remake. It’s the my favorite of the Final Fantasies I have played and I have commented on it so often that my phone auto completes “Final Fantasy” by adding “VIII”.