Adjustability, replacement parts.
Rearset adjusters are decent for doing the job cheaply, but they really aren't great for getting the levers lined up perfectly for easy shifting. Always a compromise on space and angle
Aftermarket rearsets also have replaceable pegs and levers that are intended to break off in a slide instead of damaging the rearset. Replacing a $10 lever and $10 peg is a lot cheaper than replacing $70 rearset adjuster and potentially OE priced rearset.
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