I also say SV, it seems much easier to kill DDD on that stage, maybe becasue the sides are not that huge so an fsmash is a possible kill.
There is, unfortunately, very little to say on this. But I do love the suggestion on playing near the ledge so it won't be a ridiculous cg, that was very good. And not to be predictable because that pivot grab is beastly.
Maybe a full hop dair on top of the shield then use the second jump to get away may be another wat around the grab.
For me, honestly, their bair gives me more trouble than the grab. I try to time the fair to hit them after a bair but I always screw up the timing and then get *****.