I concur with the conclusion
@Amethyst1 offers here, as a ten-year-long owner of an early 2011 13-inch MBP. Aside from some mainteinance I was able to fix myself, this system still runs Snow Leopard 10.6.8 and does so astonishingly well. There are only two notable walls I’ve hit with it, which isn’t well documented anywhere: if I run audio from it (via iTunes, VLC, QuickTime, etc.,) for a total of roughly 13 days non-stop (don’t ask), the audio begins to get “crunchy” and fails (by mostly cutting out) until a reboot. Also, pushing the video at the same time you push the RAM cap (from running a lot of open applications simultaneously for days on end) can produce a “wall of slowdown” in which the system doesn’t kernel panic, but drops to a glacially slow rate (screen refreshes at roughly once a minute) and which requires a reboot. With the latter, as VRAM is shared with RAM, this could be some kind of overflow error/crash.
If you can, try to find a late 2011 13-inch model, as this series would be the quickest of the Sandy Bridge-era iX 13-inch MacBook Pros (Sandy Bridge being the last to run Snow Leopard).
Another angle to consider:
The 2008 MacBook Pros (the MacBookPro4,1) is a bit of a bridge and also a Swiss army knife. Once you can find a GPU-repaired 15- or 17-inch 2.4, 2.5, or 2.6GHz model (Apple marked these certified repairs with the green dot on the RAM bridge, and of course
@dosdude1 provides a repair service), you’ll find this model is capable of running everything between Tiger (unsupported, but possible) and Big Sur (also unsupported, but possible), and it runs Snow Leopard brilliantly (as I’ve been learning in recent months).