I don't think it's that straightforward.
Main reason I say it is because while I would expect FD to be the better choice on paper, some characters with decent aerial mobility will still get on your face with ease no matter what.
However, from your side of things, having platforms can:
- help you set up more vertical pressure than normal, which lets you pressure higher recoveries more easily
- give you more landing options, assuming you can deal with people pressuring from below platforms
- let YOU pressure from below with kick game or nair. Up smash has enough reach to punish every legal platform I can think of, so if someone lands on a platform and you can read where they'll go (or roll if it's a bad landing), that's a free up smash. Nair pressure on platforms is also real
- in turn, having platforms lets you actually juggle uair into itself multiple times. It doesn't do a lot of damage but it forces enemies to reexamine their aerial approach.
I would say that in most negative match-ups (in your face characters like pika) platforms could be beneficial, while in favorable match-ups (ridley, probably most heavies) it's best to go FD and go nuts with range.