Windows 98 or 2000

[agmorgan]

If you had to make a choice, would you use Windows 98 or Windows 2000?
Would it be not worth installing Win2k on the specs below?
Would it run much slower with Win2k than 98?

Im basically upgrading my old PC for my mum.
As you can see, it has a small footprint and looks nice, which is why she wants to upgrade rather than replace.
http://partners.nytimes.com/library/...col-manes.html

P166MHz
87Mb RAM
4.3 Gb Hard Disk

Unfortunately the specs are pretty poor, I've managed to scrounge some RAM and a slightly bigger hard drive, but there is nothing I can do about the processor as it is limited by the motherboard, which has all the ports in a different side to which you would normally expect.