Question about GoPro Hero 8 Black incl. 32GB SD

Just take the best deal you can find for the GoPro.
Best with 1-2 additional batteries and swap the 32 with a larger one, that saves you the hassle of fiddling around later.

the 32 is enough for a few short shots. even more so if you are only recording 1080p.
but you won't get very far with 4k60fps. about 30-35min of video and the battery will slowly run out.

At best resolution (4k60, 100 MBit/s) it lasts between 35-40min. Battery lasts just under an hour.

32GB is enough for about 1.5 hours at 1080p and 30fps. If you don't have a second battery, you won't be able to record for longer anyway.