They are just really big and boring to look at (color wise). I think we had both when I was really little and I was always forced to go out to feed and water them which I hated because there were a bazillion carpenter bees, red wasps, and other buzz boys flying around the building they were on. *shudders*
I raised Californians for 4-H because they are much cuter than NZ in my opinion, but when you have 15 of the little farts and you can't tell any of them apart unless you're looking at an ear tattoo....meh.
My friends that showed Rexes could name them because they could tell them apart. lol