I have set both up, I have not seen a drop away yet that was harder to set up than a WB. The WB seems simple, and it is... until you try to make fine adjustments to it. All the ones I messed with were a pain to get right.
I'm not telling to get a different rest though, if YOU like it keep using it. Drop aways are not a miracle cure for anything either. They just let you shoot more fletching is all, providing you don't have timing issues with the rest.
As far as the string thing, I don't remember seeing too many bows where the string lines up with the tip of arrow and the sight pins. Maybe in a perfect world, but not mine
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I would like to hear what Len and Arthur have to say about it.
Paul