Let's split Resolve for Vanguards and [Insert word for Immovable or something here] for Wardens.
Resolve:
Grasp of the Undying | Aftershock |** Battle Flag**
** Battle Flag:** Landing hard crowd control on an enemy sets down a battle flag at wherever the CC was applied. The battle flag creates an AoE that grants nearby allies bonus movement speed and AD/AP (adaptive). Slows the movement speed of enemy by a small amount. Has a pretty long CD, moderate AoE. Stacked battle flags only give X % additional bonus
Perseverance | Demolish | Font of Life
Iron Skin | Mirror Shell | Conditioning
Overgrowth | Greenfather's Gift | Battle Trance
Greenfather's Gift: Staying in Brush grants tempoary bonus max health (The amount of health scales per level). After leaving Brush the heatlh remains for a few seconds.
**Battle Trance: **Staying in combat grants bonus health regen up to something.
Next is [Insert word for Immovable or something here].
[Insert word for Immovable or something here]
Guardian | Hand of the Unyielding | Something
Hand of the Unyielding: Attacking a champion marks them for a few seconds. Attempting to attack marked champions outside of your attack range pulls them towards you.
** Congregate: Immovable | Congregate: Storm | Congregate: Might**
Congregate: Immovable: After standing still for some seconds gain immunity to knock backs and stuns. Taking damage, dealing damage, or moving causes the affect to last for a few more seconds before it goes on cooldown. Moderate cooldown.
Congregate: Storm: After standing still for some seconds gain bonus damage on your next damage dealing attacks. Taking damage, dealing damage, or moving causes the affect to last for a few more seconds before it goes on cooldown. Moderate cooldown.
Congregate: Might: After standing still for some seconds gain bonus resistances. Taking damage, dealing damage, or moving causes the affect to last for a few more seconds before it goes on cooldown. Moderate cooldown.
Transmute | Life Tap | Siege Master
Transmute: When nearby allies take damage begin to build up energy. After a few seconds or after X energy is built release it to slow / stun / knock back enemies around you based on the amount of energy built up.
Life Tap: Dealing spell damage causes the enemy to take damage over some seconds and applies Life Tap when you are nearby. Life Tap creates a small AoE around the enemy, allies near the enemy heal for some of the damage Life Tap deals. Enemies near the Life Tapped enemy take some of damage Life Tap deals. Deals magic damage, the scaling it adaptive, the healing and damage aren't divided up by allies / enemies.
Siege Master: Increase magic resist and armor of you and towers when nearby any towers. Left click on any ally towers or destroyed enemy towers to activate Siege Master, channeling for a few seconds before calling out a Siege Supply Cart. The cart starts at base and moves down the lane towards whatever tower you activated Siege Master on. Clicking on the cart to channel for a second and get a Siege Supply potion. The cart holds a maximum of 5 potions that you and your allies can take, max 2 per champion. The Siege Supply Cart has 2 hit points.
Something | Revitalize | Second Wind
Hand of the Unyielding is best for low range Wardens who can apply it frequently. Long range champions like Janna, Thresh, or Lulu can't take advantage of it much due to their long attack range, so they can't double down on peel.
Transmute is just for some extra peel that's dependent on nearby allies taking damage. So it's better on Wardens who are near allies and weaker on Vanguards who are in the middle of the enemy.
Life Tap is kinda like Deathfire Touch. Wardens can take it because they'll be peeling off the enemy and will heal their allies. I put the nearby factor on so mages can't sustain their allies just from dealing damage. However long range champions can take it because it will still deal good damage.
I feel the distinction between Transmute, Siege Master, and Life Tap is large enough so that there isn't one clear better one that you will take every game.