What should I be doing to prep for Heavensward?

[Frederick22]

Technically speaking, getting the Raid one is 'easier'. While it requires a higher degree of skill to beat FCoB it only relies on a single RNG drop, whilst Zeta requires many multiples. There are fewer hours needed to be put in, and you don't need to spend a single gil on either materia or crafts (Perfect cloth selling for 200k being only one of the examples).

Personally, my advice is simple. Play the game and enjoy it. Unless you're in some mad rush to get to Ishgard, it feels foolish to disregard the game up til now just to experience it. It will come in time, and then you'll be able to play the new areas and have all the more appreciation for it. Far too many players rush content only to be disappointed when it's all finished and they're left with an endless gear-grind which renders yesteryears outfit obsolete.

Only if he is a Hrdcore player, if not Zeta is the easiest.

[nuyu11]

Only if he is a Hrdcore player, if not Zeta is the easiest.

Sorry noob question here, What is Zeta?

Is that a ilvl135 weapon that we acquire from relic quest thingy, collecting stone from fate?