I guess it's worth mentioning AF is job specific while Allagan drops are for roles. In other words, even when they have the same stats the allagan piece is better simply because it can be used by multiple jobs.

To achieve the same with AF2 (full set for every job) you'd have to always cap your mythology over a huge time period (more than a year) that's definitely much longer than a good core group running Coil can get the allagan set.