This is easy
1)The nymph guy went upstream 'cuz if you're fishing down that would be 'wet fly' fishing, but you can fish a dry either way
2) The nymph fisherman told the truth simply 'cuz he caught more fish and had no reason to exaggerate
3) The dry fly guy fished longer 'cuz he was having more fun and lost track of time
$) The dry fly guy's equipment was more expensive 'cuz ..he's a purist.... very likely using a cane rod and a fancy reel
5)..?....the nymph guy.... who else would purposely stick one of those things in their mouths ?
Good post !