i dont mean solely gf gears .. i mean the best piece for each slot .. the thread here, some players are saying if you are not getting the best gear it doesnt mean much .. my opinion is nothing but the best, every single piece
If your goal is to build the perfect twink, but never actually pvp - then you're already too late and you still most likely missed several grandfathered pieces because it was a crapshoot with what stayed good or was bad and became good.
For most people, they intend to gear a toon up to play, not put in a museum.
Like Bestworld mentioned, there are a few GFd pieces that actually can make a significant difference. I'm sure theres a few more that are extremely rare (like, maybe 1-2 twinks in the world have them still) - but these are the "big" ones in my mind.
* Emil's Brand (ilvl 32) - Much higher ilvl weapon and lots of str. Probably the biggest difference one will see. At 19, Fury/Arms/Ret aren't too OP, so even with one of these, they don't become a god or anything though.
* Inferno Robe - Tons of int, but no stam/secondaries. Really only useful on mage, lock and shadowpriest in my mind. Disc/Holy (and maybe locks) would actually prefer a balanced piece with stam/verse.
* Black widow band - Lots of int, but no stam/secondaries. A tradeoff for casters who want to go full glass cannon. There are still a few floating around unbound, but they are very expensive and no more of them will exist. Honestly I don't like this item except maybe on an arcane mage or glass cannon opening set on a boomkin. Switching from Green Lens to Spellpower Goggles Extreme Plus gives way more int and is available to everyone.
* +13 spellpower to bracers - significant SP increase, but the bracers that they were put on are likely not good.
* AGM -
Most of the other pieces that are good are a few stats different. Most of the legion gear is replaced by good rolls on BG crate gear.
So in a mirror duel, GFd gear might make a big difference. But 99% of the time, class matchup, positioning, skill, proc RNG, and individual actions are going to decide a fight before GFd gears makes a difference.