Officiating other sports

[Amesman]

With so many multiple-sport officials visiting here, a question came to mind: Which sport do you think is the easiest to add to the hoops officiating repertoire? Which sports are easiest or hardest overall, period?

I realize a lot can hinge on one's interest, personal background in a certain sport and schedule, but any observations that can be drawn nonetheless? (A respected out-of-state official recently told me, for example, he thought softball is not as hard as basketball.)