Icy-veins has recommendations for each class/spec. For example, prot pally:

https://www.icy-veins.com/wow/protec...wers-and-armor

3. Best Azerite Traits for Protection Paladin

3.1. Outer Ring

Inspiring Vanguard is our strongest trait. We always want to run with one of these traits in our setup, as multiple of this trait do NOT increase the chance to proc, but instead increase the amount of Strength gained. It has a strong benefit for survival when running Crusader's Judgment. It gives a solid amount of Strength as well on a fairly high uptime.
Bulwark of Light provides a fairly reliable small shielding effect on your Avenger's Shield casts.
Soaring Shield is a great trait and you should have at least one Azerite piece with it for Mythic+, it has however very limited uses in raids. Multiple Azerite pieces with this trait do NOT further increase the targets it will hit, but instead increase the amount of Mastery gained per hit.
3.2. Middle Ring

Ablative Shielding is our strongest raid-oriented trait, but it loses a lot of value in Mythic+ when AoE tanking. It is able to proc frequently, as you are likely to go below 40% rather often.
Crystalline Carapace has rather low impact; it basically has 100% uptime of extra Armor in dangerous situations, and causes melee attackers to take damage back which is ok in AoE situations.
Azerite Globules provides nice AoE damage in Mythic+.
3.3. Inner Ring

The trait that stands out the most here is definitely Gemhide, as this effectively has 100% uptime in any dangerous situation, increasing both Avoidance and Armor. Overall it is great for survival.