while a direct comparison is perfectly reasonable and good to look at, i will also add one section for comparison based on space. You mentioned the lvl 22 armories are 6x4=24 squares and orc nests are 4x2=8 squares. So you can fit three orc nests in the same space.
Note: Im using the numbers you provided since im not chap 22. - (And, as with anything, what to use will change each chapter along with play styles.)
View attachment 17826
Chap 22 numbers.
The top two are comparisons between a single orc nest (on the upper left) and three orc nests (upper right). Including some of the math.
The bottom two are the same thing just with the final results show.
In the bottom right set, you can see that with 3 orc nests, at chap 22 (Assuming provided numbers are correct) that a single armory would come out ahead in orc production and training size. Tho worth noting that it would take a 4th orc nest to yield more orcs (6,400) then the armory. Which would be 8 more squares.
The interesting part is the rest of the factors to consider.
1. The training size boost form the armories. This will vary for every single player. If your dependent or need that boost, then your probably keeping armories. If you dont need that boost.. then its an irrelevant factor.
Me personally, at only chapter 9, my bulwark and shrooms are a high enough level that my training que in the barracks is around 17-18 hours long. (With a lvl 30 needles for training time boost). I will be on before 17-18 hours runs out to set more troops to train. Unless something horrible happens irl, ill be on to do that. (And if something irl happens... then i probably wont care about the game in that moment.) So since my training que is already long enough... i have no need for the small boost from the armories. So it doesnt matter to me.
Also worth noting, this is another effect of the AW change. The shrooms used to be tired to the armory levels. If it still were, then we may not be having this conversation. Because while i can do without the small boost from the armories directly, the combined boost from the shrooms (based on armories) i would have absolutely needed. So under the last aw system, none of this would have come up for me. Only because inno decided to make shrooms independent of armories.. does this become an option for me.
2. Culture provided/taken
Armories take culture. A chap 22 armory takes 57,000 culture per armory.
Orc nests take 0 culture. - Huge difference.
Orc nest also PROVIDES culture. It gives 10,000 for one nest (according to the provided numbers).
So thats a differece of 67,000 culture on a 1:1 scale. - On a 1:3 scale thats a difference of 87,000 culture.
3. Population
Armory takes 25,000 pop at chap 22.
Orc nest takes 0 population.
4. Ranking points.
This one always favors the armories.
Armory at chap 22 provides 82,000 ranking points
Orc nest provides 0 ranking points.
If you care about ranking points, then armories wins this round hands down. If you could care less about ranking points, then this is irrelevant.
5. Orc nest
You actually have to get the orc nests. Be it through an event or crafting. But you have to get the multiple orc nests.
Armories can be built any time. Tho potentially a lot of time to upgrade if starting from scratch.
6. Collection time
Armories are a set time. You set a production for 12h, 24h, 48, 96h. When its done, its done. If you show up late one day and collect and reset, then your next days collection will be later. You either have to accept that and work with it. Or do a 12h production to try an get your schedule back on track the next day.
Orc nest are far more simple. Its a 24h production. But you can collect ANY time after 12h. After that 12h mark, if you dont collect then the orc nest keeps making orcs until the 24h cap. Providing much more flexibility to a time schedule without losing out on orc production.
7. Supplies
Armory orcs take supplies to make.
Orc nests do not take supplies to make.
So its interesting comparing the different factors at play here. Each player could come up with a different final answer depending on there needs.
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Heres another comparison. This time between a single armory vs 3 orc nests at the start of chapter 8 when you first get orcs (armory lvl 20), and the end/cap of chapter 8&9 at cap level (armory lvl 23). (Armories reach level 20-23 at chap 8. Chap 9 is the same levels as chap 8. No more upgrades appear until chap 10).
I also added orcs per 24h in addition to 12h
View attachment 17830
I guess it shows the flip flop nature of buildings and productions. Orc production, strickly, at chap 22 showing a slight advantage for armories over 3 orc nests . Where as on chap 9., where i am, its a different story. Orc nest out performs orc production by a lot.
Note; my armories were lvl 20 when i teled them to inventory. So i dont have the numbers for the ranking points or 12h production for a lvl 23 armory.