Hmm so do you think Aello has better drop rare on hmp vs qilin? Debating on putting time into farming hmps now. Kaggen takes forever and it's potentially 2000 kills.
The droprate is roughly 6% across the board:
http://ffxidb.com/items/5910
Click the "voidwatch chests" tab to see the droprates. Aello is listed slightly higher at 6.3% but also has a much smaller sample size.
Aello is considerably more annoying to kill than Qilin. It's gotten to the point that just about every aspect of her pisses me off (which tells me I've been spamming her too much these last 2 weeks). She spawns with 3 adds that like to scatter like roaches when a lightswitch is turned on, so it makes her obnoxious to target. She has a move that causes amnesia (albeit, rarely) that can last up to 50+ seconds. However, the worst is Shrieking Gale which causes knockback and always seems to dispel haste or attack bonus...
Qilin dies much faster, has no annoying tp moves, takes a lot of damage from light skillchains, but is more annoying to get to. Overall I consider Aello faster just because she's so close to the HP #5 entrance, but after you've killed her 100+ times in a row and your luck with pouches has been poor, everything she does just makes you rage...
Regarding Kaggen, it's nice to see plates drop so often, but his droprate is only 35% per individual plate:
http://ffxidb.com/items/3509
So, per 100 kills against Kaggen you could expect to see roughly 35 plates. Per 100 kills against Aello you could expect 6 pouches, which contain 3-15 plates (avg of 9 per pouch). With 6 pouches at 9 per pouch, you'd expect to see around 54 plates per 100 kills - considerably more than Kaggen.
Just yesterday I cracked 129 pouches (pouches stack to 99, so I didn't crack any till I knew I was close to finishing to save inventory space). In those 129 pouches, I got 1141 plates.
1141 / 129 = 8.84 plates per pouch (very close to the 9 I estimated above)