A SB16 could work in any of those computers, and people with limited budget could keep their SB16 for even a Pentium III.

If you were buying a new computer, a SB16 could be a logical choice for a 486 (or a clone if you were buying cheap). In a Pentium II, most computers were equipped with cheap (useless for DOS) PCI cards, like the SB PCI64/128 (or Ensoniq ES1371).

A Pentium PC is a though decision... I've seen those computers with PCI sound cards, but in earlier Pentiums (60~100Mhz) they were bus hoggers and tend to do some background noises (on real PCs, I guess that they won't do that on emulated hardware). I'd use a SB AWE because I feel that it fits that CPU perfectly, but they weren't cards offered with that computers (again: ISA or PCI cheap cards).

Agree with Zup's comments.

PCI sound cards didn't really gain wide spread adoption until 1998 ( as people started to upgrade to Pentium II PC's).
Many people bought Pentium MMX CPU's in 1997 and 1998, due to the high cost of the Pentium II and, although some later models (from late 1997 & 1998) might have had PCI sound cards in them (most likely OEM builds), I would say that an ISA card is a better fit.

Pairing your Pentium I with an AWE based card should be period correct since the first AWE32 was released in 1994 and the last one (the AWE64) in late 1996 and many people would have used those cards well into 1997 and beyond until they upgraded again.

Thanks guys for your feed back on reccomended parts. ISA cards are proving their worth in retro setups. I know when I go for a physical rig, I'll get an SB16. Now to start building these rigs.