Lvl 6. Because for me It's one of the more usefull skills that cleric has, at lvl 6 can protect you from 7 hits. (Usefull if last boss in Apocalypse start spinning right at you).
Max Lvl. Usefull to dodge attacks in pvp/pve low cooldown at lvl 5.
Lvl 9. Usefull and recover a great ammount of HP at max lvl, and It's a good support for your team members.
Lvl 4. The difference with lvl 3 It's not that much.
Lvl 12. Max signature skill for Crusader!
Lvl 3. You'll need it at lvl 4 to provoke all the time, but lvl 3 is alright for me.
Lvl 1. Really low % to activate on higher lvls only lvl 1 to learn next skill in the paladin tree.
Lvl 3. Only lvl 3, allow you to do 3 normals attack instead of 1. You need it at lvl 3 to learn Lighting Charger.
Lvl 2. You need to learn Armor Break, basic skill in pvp if you want to start your combo.
Stance of Faith:
Lvl 5. This buff is really usefull in pve to tank as a Crusader/Guardian is a most have, really usefull.
Lvl 10. This skill is one the best skill in Paladin skill tree, low cooldown, good damage and reduces physical def from mobs/bosses.
Lvl 3. Lighting Charger had a huge nerf, allowing you to only hit 5 targets, still does good damage on pvp and bosses.
Lvl 2. You'll need it to support your team in SDN.
Max Lvl. The strongest skill that Paladin has besides Divine Avatar. Is a most have obviosly so I choose to go all the way with it so I max it.
Lvl 1. You only need this skill to chase people in pvp and mobs or bosses in pve, the damage It's ok.
Will of Iron:
Lvl 1. You can choose either learn it at lvl 1 or no, and just for directly for Divine Avatar.
Lvl 2. This buff increase The Lighting attack and resist for you and all your team members.
Lvl 40 Ultimate Skill, It's not the best compared to Divine Avatar but you will need it to learn skills in Crusader skill tree.
Previosly you couldn't learn it because of the restriction with the last update you can go Crusader and have it!. :D
Crusader skill tree:
Doesn't need explanation learn all the 3 skills.
This have been updated to the last update where you can learn both Ultimates, the 10 sp left are to learn Divine Avatar.