Every SB16 has bugs, mainly but not exclusively around MIDI playback.
Question is what you will be doing with it. If you only intend to use the card for digital audio, the AWE64 DSP-based cards (AWE64 cards but also AWE32 CT4330 and SB32 CT3670) will be effectively bug-free. All the others have things like hissing/ringing (Vibra cards) or single-cycle DMA clicking (non-Vibra SB16/SB32/AWE32 not listed above).
If you want to use a MIDI device with the card, the AWE64-variants are also best as they only suffer from slowdowns when playing MIDI and 16b audio at the same time. The very oldest SB16(CT1730-1790) are similar, but are very noisy. The rest all have hanging notes issues of varying intensity.
How badly these issues will irritate you is completely subjective. I can't stand the hanging notes and MIDI slowdowns, but am only lightly bothered by Vibra hissing/ringing, and can't say I even notice the DMA clicks or bad noise levels of early cards unless I'm specifically listening for them. You might have different priorities.
If you really don't want any of this, you need a non-Creative card, see link Oetker posts (conclusion: the MK8330 is by far the best jack-of-all-trades currently available).
But... EUR 20 is very cheap for an SB16. At that price you may not be able to do better. Which cards are they exactly (give the CTxxxx model number)?