If your goal with this tank is not to have it heavily planted, then I would go with the flourite or even a cheaper substrate. Consider, also, that many plants may not like discus temperatures. It really depends on what you plan on growing and what you consider a limited amount of flora.
I've used both substrates and AS blows flourite out of the water in terms of growth. The ammonia leaching and lightness are annoying though.
I've used both substrates and AS blows flourite out of the water in terms of growth. The ammonia leaching and lightness are annoying though.