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Between the three is there a favorite?

This is one of those choices that falls into the category of personal taste and priorities than any technical reasoning. I found AirRadar when it first came out and liked it. It is informative, and has an easily understood interface. I continue to use it because I have never found any reason to change.

MacStumbler has been around for a long time and many people swear by it and I have never heard anyone swear at it. The Beta is MacStumbler 2. There is another product out there called iStumbler. There is an interesting discussion comparing iStumbler and MacStumbler here.

WiFi Scanner is new to me. I just found it in the App Store and installed it on a friend's computer. Personally I find that while it displays the same basic data as the others it takes me more effort to comprehend what it is saying.

Again, it is a matter of personal taste and priorities.

If we knew what it was we were doing, it wouldn't be called research, would it?

— Albert Einstein