Personally, with so many frags I rotate between, a large flacon scares me. I personally don't think all frags age well, especially Creeds. But if you have one you plan to use a lot and think it will only last a year or so, go for it. It's way more economical than 75ml bottles if it's a Creed.
Others may disagree. I don't keep in most optimal environment, so I may not be the best judge. Just had to pitch a BdP that was 7 years old and played out.