2K will certainly best 98 in terms of stability. I also found that 2K boots faster than some of the 98 machines I use. It mostly depends on drivers and software loaded at boot time.
The worst culprit for slow booting in Windows seems to be SCSI emulation software for IDE CDR drives.
Once booted, 2K performs quite nicely. It likes RAM, so 256+ MB will give you the best performance. I also reccomend using NTFS, but disabling file indexing for best disk performance.
Atx