for hard wired, I use Intel. Great support in many OS's and just rock solid stable without issues. Had one die in 3 years in the test lab. Gone through several 3Com 3C905X's, and we don't bother with off brand, too much hassle.
For wireless, Atheros hands down. Best H/W, Best utility for configuration (windows). This is what is in the high doller Cisco CB21 cards. Intels are pretty decent, but the utility is hairy (and getting worse every rev) and they have strange roaming.
Worst: In my experience os realtek for wired, Broadcom for wireless (although I don't use any home user wireless cards, such as DLink or Linksys)