For trad climbing Id definately recommend 2x 50 or 60 metre 1/2 ropes, around 8 - 8.2mm
Pretty much, the thinner the rope the less falls it tends to take, with double ropes you can (on average) share the falls more than a single rope, in my opinion. It also greatly reduces the drag, and is better for protection on routes which wander (such as multipitches) or traverses.
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