If I have to pick one system, then it's PS1 era. FF7 is my favorite mainline game and FF9 is my second favorite. (Although FF8 is the game I'd rate second worst.)
Overall, I'd prefer to say that SNES/PS1/PS2 era was Final Fantasy at its very best. It was my favorite video game series during all of those eras. I also really love FF1, and FF13 becomes a good game if you have the intestinal fortitude to endure the first 20 hours or so.
curl-6 bet me that PS5 + X|S sales would reach 56m before year end 2023 and he was right.
My Bet With curl-6
My Threads:
Master Thread, Game of the Year/Decade
Switch Will Be #1 All Time
Zelda Will Outsell Mario (Achieved)
How Much Will MH Rise sell?
My Bet With Metallox