Hey, saw someone curious about this, so I thought I'd pen it down. I've never crafted such an overview or guide, so feel free to critique and discuss. I'll categorize the instances into PvE and PvP Gearing, though note that PvP gear often shines in PvE too, and vice versa.
I'm only highlighting instances with notable drops and will try to cover all using the NA/English Client names.
PVE Gear (Easiest to Hardest):
Besmundir Temple: Level 55 eternal gear with 5 slots and basic stats for magical classes (can't farm with lvl 65)
Rentus Base : Level 60 (not entirely sure) eternal gear with 5-6 slots, (1st boss' shield is superb for healers)
Tiamat Stronghold : Level 60 eternal gear with 5-6 slots (can drop a speed mage weapon)
You can bypass all the above with BM gear, farmable via Garrisons in Kata/Danaria
Sauro Supply Base + 1Key Boss : Level 65 mythical gear with 5/6 slots and semi-random stats + top PvE accs
Danuar Sanctuary : Level 65 Eternal gear (not great for its challenge) + best cloth armor speed gloves + ceranium medals
Ophidan Bridge : Level 65 Eternal gear (not great for its challenge) + best cloth armor speed gloves + ceranium medals
Illuminary Obelisk : Level 65 mythical gear with 5/6 slots and semi-random stats (2nd highest base attack for physical classes + only PvE AtkSpeed harp
+ strong Supp chanter set + helmet, Kahrun is just a hair inferior)
The Eternal Bastion : Level 65 mythical gear with 6 slots (highest atk stats but lower hp values) + ceranium medals + AP
Infinity Shard : Level 65 mythical gear with 6 slots (below average stats but set-effect = best all-around set, beaten by Bastion for damage,
but faster to acquire) + robust set-effect accs (full Sauro is superior). Also awards glory points
Dragon Lord's Refuge: Level 60 Eternal gear, primarily for extend weapons you upgrade once (modified has identical stats to fully crafted)
Sauro Supply Base +2Key Boss : Level 65 mythical gear with 5/6 slots and semi-random stats + best PvE accs (2-key boss guarantees mythical drop)
Danuar Reliquary : Level 65 mythical gear with 5/6 slots and semi-random stats (premier healer shield + top-tier helmet + top-tier warhammer)
Ancient Coin gear trumps BM gear but is weaker than Sauro gear etc., yet it's cheaper to enchant, making it a solid starting choice
PVP Gear (Easiest to Hardest):
Krotan/Kysis/Miren Barracks: Ceranium medals + AP
Danuar Sanctuary : Ceranium medal
Ophidan Bridge : Ceranium medal
Danuar Mysticarium (S-Rank): Ceranium medal + minimal AP
Void Cube (S-Rank) : Ceranium medal + minimal AP
Idgel Research Center (S-Rank) : Ceranium medal + minimal AP
The Eternal Bastion : Maximum amount of ceranium medal + AP, also grants glory points
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Edited by Shinimasuadditional info to io