If I recall corrrectly (I'm surprised someone has not already commented) . . .
The one with the full range is Buzz Kidder's personal site. The other is a vendor of his stuff. I seem to remember some previous business relationship (like partners or something, maybe some personal relation or friendship . . . again, I forget).

A previous thread:
http://www.xmarksthescot.com/forum/s...ad.php?t=21853

Another more detailed one is in my head, but I can't seem to locate it.