Confused What Ring To Get

http://ffxiclopedia.wikia.com/wiki/Seekers_of_Adoulin_Rings
since my main is PLD don't have a DD yet will be RNG I believe.
I have physical damage set for PLD.

Karieyh Ring or Orvail Ring or Haverton Ring?

Ranger has a really easy time capping snapshot AFAIK, so I wouldn't worry about haverton. I like Karieyh for my DD, but Weatherspoon is amazing for casting.

Pet ring FTW!!!

Weatherspoon Ring or Vocane Ring.

Vocane might not help your PLD, except maybe opening up DD potential, but it's great for every other job in the game. That said, there are other PDT/MDT rings that achieve similar effect.

Weatherspoon is great for any casting job -- I use it not just for mage jobs, but for any job that uses /nin. It has a noticeable effect on survivability if you can get shadows off in time.

Weatherspoon lost much of it's appeal given that quick magic caps at 10%. Most mage jobs can already cap fast cast.

Vocane is good, I have some orvails but it seems to be a relative 1% boost to HQ rate(.0625 > .0631, not .0625 to .0725) so it's almost worthless in reality. Pet ring or movement if they suit you.