I think any benefit of using 98 is quickly balanced out by the fact that nothing supports it any more.
Furthermore, since it is an older design, lots of software written with principles acceptable for Windows 98 may very well not work in Vista or even XP, although testing and forward thinking do help a little bit there.
Furthermore, since it is an older design, lots of software written with principles acceptable for Windows 98 may very well not work in Vista or even XP, although testing and forward thinking do help a little bit there.