@Esker, I'm interested in your observations for this character at level 6. I get an extra use of the channel divinity. I get spirit guardians and spiritual weapon (traditional cleric damage spells). I have an ASI choice.

What would you choose and what would be your basic damage combat progression for single target.

I'm thinking level 3 inflict wounds, level 2 inflict wounds, attack bonus attack

For all out damage you could use all high level inflict wounds. Something like 77 damage over 3 turns.

Let's compare that to taking GWM, which lets you take full advantage of Guided Strike (unlike inflict wounds where a +10 is overkill most of the time).

__Option 1____:__ Using War Priest bonus action attack with GWM (assuming base to-hit is down to 55% since we didn't boost strength):

Avg damage per hit: 2 * 3.5 + 13 = 20

__Round 1:__
Chance we have 2 guided strikes left: 1.00

0.80 chance to hit with guided strike

Damage per attack: 0.80 * 20 = 16

Expected damage Round 1 (using War Priest): 32

__Round 2:__
Chance that we have 0 guided strike left: 0.50 * 0.50 = 0.25

Chance that we have 1 guided strike left: 2 * 0.50 * 0.50 = 0.50

Chance that we have 2 guided strike left: 0.50 * 0.50 = 0.25

Main attack to-hit: (0.30 + 0.75 * 0.50) = 0.675

Chance that we have 0 guided strike left now: 0.25 + 0.50*0.50 = 0.50

Chance that we have 1 guided strike left now: 0.50 * 0.50 + 0.25 * 0.50 = 0.375

Chance that we have 2 guided strikes left: 0.25 * 0.50 = 0.125

Bonus attack to-hit: (0.30 +(0.375 + 0.125) * 0.50) = 0.55

Expected Damage for the Round: (0.675 + 0.55) * 20 = 24.5

__Round 3:__
Chance that we have 0 guided strike left: 0.50 + 0.375 * 0.50 = 0.6875

Chance that we have 1 guided strike left: 0.375 * 0.50 + 0.125 * 0.50 = 0.25

Chance that we have 2 guided strike left: 0.125 * 0.50 = 0.0625

Main attack to-hit: (0.30 + 0.25 * 0.50) = 0.425

Chance that we have 0 guided strike left now: 0.6875 + 0.25 * 0.50 = 0.8125

Chance that we have 1 guided strike left now: 0.25 * 0.50 + 0.0625 * 0.50 = 0.15625

Chance that we have 2 guided strike left: 0.0625 * 0.50 = 0.03125

Bonus attack to-hit: (0.30 + (0.15625 + 0.03125) * 0.50) = 0.39375

Expected Damage for the Round: (0.425 + 0.39375) * 20 = 16.4

Cumulative Damage (1st 3 rounds): 32, 56.5, 72.9

Chance that we have 0 guided strike left now: 0.8125 + 0.15625 * 0.50 = 0.89

Chance that we have 1 guided strike left now: 0.15625 * 0.50 + 0.03125 * 0.50 = 0.094

Chance that we have 2 guided strike left: 0.03125 * 0.50 = 0.016

Expected Guided Strike Remaining: 0 * 0.89 + 1 * 0.094 + 2 * 0.016 = 0.126

War Priest Remaining: 0

3rd level Spell Slots Remaining: 3

__Option 2__: Inflict Wounds, Boosting Wisdom

Avg damage per hit (3rd level): 5 * 5.5 = 27.5 (assume 60% base-to-hit)

__Round 1__
Chance we have 2 guided strikes left: 1.00

0.95 chance to hit with guided strike

Expected damage Round 1: (0.60 + 0.35) * 27.5 = 26.1

__Round 2__
Chance we have 1 guided strike left: 0.35

Chance we have 2 guided strikes left: 0.65

Expected damage Round 2: (0.60 + 0.35) * 27.5 = 26.1

__Round 3__
Chance we have 0 guided strike left: 0.35 * 0.35 = 0.1225

Chance we have 1 guided strike left: 0.35 * 0.65 + 0.65 * 0.35 = 0.455

Chance we have 2 guided strike left: 0.65 * 0.65 = 0.4225

Expected damage Round 3: (0.60 + (0.455 + 0.4225) * 0.35) * 27.5 = 24.9

Cumulative Damage (1st 3 rounds): 26.1, 52.2, 77.1

Chance that we have 0 guided strike left now: 0.1225 + 0.455 * 0.35 = 0.282

Chance that we have 1 guided strike left now: 0.455 * 0.65 + 0.4225 * 0.35 = 0.444

Chance that we have 2 guided strike left: 0.4225 * 0.65 = 0.275

Expected Guided Strike Remaining: 0 * 0.282 + 1 * 0.444 + 2 * 0.275 = 0.994

War Priest Remaining: 4

3rd level Spell Slots Remaining: 0

I didn't factor in crits, which would favor inflict wounds a little. So damage-wise, blowing 3rd level slots lags a little behind using war priest in rounds 1 and 2 if we take GWM, but we tend to use only one Guided Strike, vs usually using both with GWM and War Priest, and if we need more than two rounds, we have more left in the tank. Plus we didn't spend a feat dedicated to nova tactics.

In the narrow scope of the theorycrafting exercise, it's a tough call; blowing all three 3rd level slots in one fight is a lot, but then so is blowing all three of our bonus action attacks and likely both of our channel divinities. In reality I prefer inflict wounds, mainly because I don't want to take GWM on a character that never gets a real second attack just to do a little better damage over two rounds.