There's no such thing as "100% DOS compatibility", as there is no such thing as a DOS sound system: games directly addressed the hardware and different periods and indeed different games used different cards; the most compatible (eg old mono Soundblaster cards) will lack a lot of features for newer stuff. There are massive rabbit holes to go down with DOS gaming and sound cards, with people builing multiple builds around multiple cards.
You probably don't want to do that, so it would help if you could narrow down what you mean by "DOS compatibility". What sort of games from what sort of era? With that CPU you're not likely to be playing XT-period games anyway, so probably don't need to worry about extremely early sound hardware.
Another thing to bear in mind is that there are multiple ways in which sound cards generate sounds (digital audio, FM-synthesis, wavetable synthesis through MIDI interface etc.) and that almost all cards contain two or more of these functionalities.
A quick analysis of your cards:
AWE64 value ISA CT3670 - FM synthesis using CQM (unliked by most), least buggy SB16 (only slowdowns when playing MIDI at same time as high quality digital audio), and EMU8k ("AWE") wave synthesis with SIMMs to support big sound fonts
Audician 32+ ISA - real Yamaha chip with OPL3 FM-synth (the original, generally considered best), bug-free MPU-401 MIDI but no SB16 support (only SBPro2 and WSS 16b audio) and no onboard wavetable.
AWE32 ISA - exact features/options depend on which of the many AWE32 cards it is. Unlikely to be superior to CT3670 except perhaps real OPL3 for FM-synth, but in that case more MIDI bugs and in any event single-cycle DMA clicks.
With two ISA slots it would be a no-brainer: use the CT3670 and Audician 32+ together, with SB16 and AWE from the CT3670 and OPL3 and MIDI (as well as SBpro2 and WSS if needed) from the Audician. If you just have one slot, it's tougher, but despite my not exactly liking Creative and the whole hype around their cards, the CT3670 is the more compelling single-card solution. It can do a lot more than the Audician (even if some things might not sound as good - metallic FM synth and MIDI slowdowns when playing high-quality DA sounds in games like Tie Fighter) and it's definitely superior to any AWE32.
That's DOS covered. For Windows, positional audio is the interesting bit. All the Sound Blaster Live/Audigy cards do EAX very nicely. I second the Audigy 2ZS as best of your selection for Win98.
Then interoperability - firstly as DOS doesn't actually have a sound system, so long as it doesn't conflict with ISA resources, if you don't tell a game a card is there, it has no influence whatsoever. So the Audigy2ZS can be in the system and not in any way effect DOS. The other way round, Win98 does have a sound system and can handle multiple cards. You can choose whether to only have the Audigy active, or whether to also use the CT3670. In the latter case you can use the EMU8k ("AWE") for Windows MIDI output. Note however that there are quite a few softsynths available for Windows that actually do an arguably better job at wavetable synth than the EMU8k, so really its added value is CPU offload, as it saves the cycles used for a softsynth. You can have both installed and play around seeing whether you prefer quality (softsynth) or performance (EMU) - and you can even choose differently per game if so desired.
