I started putting a table together for myself to compare the different IL90 gear without having to look at 20+ individual items, and I thought it might be helpful to post them here for others since quite a bit of thought needs to go into AF2 prioritization with the 300 per week mythology limit.
Images spoilered because they break the page:
Edit: Stopped updating tables below and moved stuff into Google Docs, follow link below (tables below are outdated as of patch 2.1):
As far as a discussion on this thread goes, while primary stats are pretty clearly what you want to max for each slot (except in some maybe extreme crafted item materia melding cases which probably fall out of the scope of this discussion), seeing as all IL90 gear for the same job(s) have the same primary stats, picking Allagan over AF2/Hero's or vice versa is all about the secondary stats.
What kind of secondary stat priority order do people find preferable for the different jobs? I'm not only thinking about obvious bonuses like critical hit rate and determination effects on damage, cures, etc., but also about less obvious bonuses, like how a critical hit on Adloquium doubles the amount of HP the shield it grants will absorb.