If its just for using, well I like RedHat 8. It is what I used to do my work, email and surf the net. Pretty much a default install with a few changes (changed some shortcuts and use single click...added RTCW and Quake II, otherwise a default install).
Works well out of the box. All hardware was properly detectied.
Mandrake 9, well its what I customize and experiment with as well as surf. I am writing this on ML9.
Well, if I had to just choose one, at this point I would go with RedHat 8 (here come the bombs).
[Win98 is what I used to play games (Battle of Britain, IL-2, Strike Fighers, Operation Flashpoint and a bunch of other stuff I dont think will ever be ported to Linux)...]