Newfoundland is really big. I spent 10 days there a few years ago and didn't see a single moose, even while driving at high speeds at night (in desperation to see one!). Much of the interior involves endless pine forests. I went all the way from St. John to Labrador.

Nova Scotia I combined with PEI and the Fundy area of New Brunswick in 7 days a few years ago on another trip. The Cape Breton Highlands are very nice.

So, both are worth visiting, but I would likely choose Nova Scotia first, even though I did it in reverse.