Skyly is great for Hunter weapons. Unfortunately, it's not particularly good at Armour, Shields and Units. I tend to view Skyly as an ID you have accompanied by another character who can hunt armour/units and so on. It's a great ID, but you might find you need friends/other characters to help in the defensive department.

Thankfully, Episode 4 gives a few armour drops, but for a good Hunter you'll need a /Battle unit and a decent shield, which can be a problem sometimes.

No one ID gives the 'best' rares though. A lot of the uber-rare stuff is spread out across the IDs.