If I had to choose a wifi card for my HPC's, I would choose an Orinoco Gold for more then three reasons ...
1. It is compatible with a vast range of vintage HPC's, ranging from CE 2.0 onwards.
2. It seems that everyone is recommending it along with the Linksys card, and
3. It is not hard to find, on Ebay there are still cards sold brand new for less then £15.
... 4. Just desire that name ... 'look! I've got an Orinoco GOLD!'
With users that only use CE 3.0 or CE 4.2 for their HPC's, a Linksys card would make more sense as this has an easy setup configuration, more modern I think, and is plug and play on CE 4.2 models.
Hope this helps choosing a wifi card.
I don't have an Orinoco Gold yet, but I will get one sometime cause I want Internet!