I'm still using an Audigy 2 ZS I purchased in 2004. My 2007-ish motherboard sound device is turned off in BIOS. Why? Two reasons:
1) Motherboard sound is full of noise and glitches (pops and clicks).
2) Even more importantly: The onboard sound hardware *actively interferes* with sound under Linux. I have to turn it off, or I have mysterious and disruptive sound problems. Such as fmod using 100% of CPU cycles.
I can only speculate on the real cause of #2, but if experience is any guide, it's due to half-baked hardware that only "works" with a Windows-only driver.
This is why I put "works" in quotes: Even when integrated sound hardware works under Windows, it doesn't necessarily work all that well. I bought the Sound Blaster because the integrated audio on the PC I built in 2003 was also flaky.
The Audigy 2 ZS works absolutely fine under Ubuntu, so that's what I use. Yes... ... I have zero problems with this card and PulseAudio. But the onboard sound device is a piece of junk. Motherboard manufacturers throw in the cheapest junk they think they can get away with. They certainly don't give a damn whether it works in Linux.