Primarily due to legacy issues (now long since corrected) and the fact that I'm lazy, I have a multiple (3) hub set up. One C8 with all my Z and Matter devices, a C7 as the Automation/ Server hub and a C7 handling the Cloud integrations. I currently don't have a huge system as far as the number of devices and rules goes. A mix of (maybe) 40 Z devices, mostly Z-wave a few each Zigbee and Matter.
If I were to purchase a C8, would it Be better deployed as the device's hub, or as the automations/ Server?
Per your topic title - just to confirm, you mean C8-Pro, I assume. 
We "Pros" are sticklers about getting the naming right. 
Good question...I'm not actually sure what puts a bigger load on the hub, lots of devices, or lots of automations/integrations. I'd think the former...but... 
Looking forward to smarter people (e.g., anyone else) chiming in.
We "Pros" don't just refer to ourselves
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Correct.
Based on what I'm seeing in my Grafana dashboards, it seems like the Devices place the heavier load, hence I'm leaning in that direction. But I think I can also see where the extra memory and processing power could be advantageous on the Automations side as well.
Ah, DOH, you do have hubs w/either devices (C8) or automations (C7) on them, so you can compare memory and CPU load between them. That seems like a good real-world look. C8 and C7 have the same CPU/memory...
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I'd suggest first trying everything on a single C8 Pro. It's will very likely work unless you have some non-common really chatty apps/devices.
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Ehh that's a lot of work to move everything back. I'm lazy, remember? haha. Every now and then I get wild hair and think about putting it all back together. Too bad you can't migrate from multiple hubs to a single hub.
I'm sure it would. I think even the C8 could, though without the matter integration. I think that is what is hitting the memory harder.
The original issue was on a C4. When the C7 came out I bought one and split the load, then things started to multiply like rabbits. Now there's 2 C8's (one not currently in service) and 2 C7's. Oh, and Home assistant on a Mini PC that I haven't done much with yet.
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Just update them all to c8 pro. Discussion over
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By the time I do that the C9 will be released and I’ll have to start over! 
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And your point is?
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