You should definitely both give it a try.

It will definitely run perfectly well on both of your systems. The xubuntu alternative version (available to download from any of the normal xubuntu download links on the site) works perfectly well with 128MB of ram and the download ISO is a single 557MB CD ISO. T

@ AlexJ. An 800MHz system should be very nice considering my 450MHz laptop is running it ok without much waiting needed to complete most tasks. However if you could get the ram up to 256MB then the full version of Ubuntu would work perfectly well.

@Buleste. And a PIII 500MHz machine will be quite a bit quicker than my laptops AMD K3 processor so it would run very well too.

I've not tried UAE on it yet, but I'm guessing it won't be amazing on my laptops CPU. I will give it a try when I get chance though.