Depends on the size of the balconies.
The technical answer is there will be bugger-all difference.
Let's say a slab on ground cost $100 per square metre.
And a suspended slab + railings etc might be $250 per square metre.
An 80sqm courtyard and a 30sqm might work out similar in cost.
But even if the cost is different, they depreciate at 2.5% so the difference in depreciation isn't going to be worth thinking about.
You need to consider which property will give you the better rental return and growth.