The idea behind right side crank on a "left handed" spinning reel is, you don't have to switch hands to retrieve after the cast.
With conventionals, it's more a matter of tradition. Originally, they were direct drive (1:1 retrieve) reels. Even after they started using "multiplier" gearing, they were still pretty slow, so they were made for an angler to reel with his dominant hand, for a faster retrieve. Same reason that most fly reels come set-up for right hand cranking.
On a spinning reel, the handle moves in a much wider arc, so cranking is easier with your off hand. You use more wrist on a conventional, while with a spinner, you can use the muscles of your forearm more.
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