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... I would imagine the overwhelming preference is Dichlor.
Baqua eats polycarb plastics. Unless the tub has had a new lens put in which has the three-piece arrangement, you should NOT use Baqua.
...The only question I have is whether to go ahead and get that JED ozonator before I even fill up the tub for the first time, or if a small tub like this is just as well served by just using chlor...seems like an ozonator should be installed before the water goes in?
you've got time to get a little experience and do some more research before making the decision on ozone.