Strikers get the Eternal Warrior and Insurmountable Skullfort. And then Sentinels get Helm of Saint-14 (only usable by one code), Doom Fang Pauldron, and Ursa Furiosa. Sunbreakers have 3: Hallowfire Heart and Ashen Wake... and kinda Khepri's Horn. Each subclass has basically 2 exotics. And the one that has 3... well. Doom Fang is awesome with Aggressor, but is meh with Protector. Saint-14 is worthless unless you're Protector. And Ursa Furiosa works with all three, but I don't know if damage to Ward of Dawn returns Super energy (can someone test?). So... even with 3, the sentinel ones are very Code specific. So I can't say they have a real item advantage since only 2 of them are only really good for one Code.