How many Pi's do you own ?
Now that you ask, I may've lost track counting.

It's still in the single digits, four 4Bs and one Compute Module 4. They are fun to play with and reasonably energy efficient, so it doesn't hurt too much to run multiple of them.
I wouldn't run an IBD from scratch, if I don't need to when I have enough samples of full blochchain data. The last IBD on one of my Raspis was more an experiment to check how long it takes with optimized
dbcache setting. In the experiment my Raspi finished IBD in just 4 days, but that was some time ago. Now, I assume it'll take more like 5 days (storage being a SATA SSD).
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Mini PCs can be quite efficient, not sure if in the same range as a Raspi 5 though. You can have more RAM than with a Raspi 5 easily which is in most cases always a nice-to-have and proper storage with NVMe SSDs is a given (the Raspi 5 needs a daughter board to use NVMe storage via PCIe; at least a good improvement over a Raspi 4B).