Agreed. On a new drive - and I HATED to paint it the first time, I would use a Green scotch scrubber. But, once you have painted it, you can use either or. Either way, I'm not talking aggressive sanding - light with 120 or so - I want to remove the oxidized paint. Where metal shows, I sand it to bright aluminum so the primer has a better chance to stick.
When you paint a never before painted drive with antifouling - no matter how you prep it, there will be areas that will come off in 'sheets' - 1/2" or so after a season... These need to be feathered and a scotch pad ain't gonna cut it. Whenever possible, don't use sandpaper, but at some point, it will be needed.
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