Membership vs Premier Pass?

Hey guys, I'm thinking of getting either membership or premier pass. Here is my background:

1. My non-combat skills are on average level 50, highest is lvl 68 mining.
2. My combat skills are on average level 30-35.
3. I haven't done many free quests.
4. This is my first time buying membership.

Is it true that you only get 1 treasure hunter key if you get premier pass? I kinda like those a lot. Also it seems like a big commitment to get 3 months but the yak track rewards are tempting! Also, realistically, I only have about 1 month to play.

Please share your pros and cons!