Part of the charm is to see what they can manage to cram out of the classic hardware. Take the recent demos made for the Amiga 500 and Amiga 1200 for example. A lot of the effects shown in these productions were reckoned impossible to do back in the day. That is quite an amazing accomplishment.

Due to this, I tend to think of many PC demos (not all) as a bit boring. Fair enough that they perhaps contain pretty visuals, but if one starts thinking about the hardware they have available, it's not impressive in the same way. You can do a lot of stuff with a top of the line graphics card and 2GB of RAM.