Tourist guides for Brussels seem to agree on a few things:
(a) The correct way to eat a Belgian waffle is au naturel—the waffle, not the consumer. Only scoff-worthy tourists top it with chocolate, fruit and whipped cream.
(b) Proper Belgian waffles all taste more or less the same. Just make sure you avoid the rectangular ones.
(c) When it comes to waffle dealers, they are all equal.
Having tasted many waffles during my stay, I agree:
(a) While the toppings were delicious, they completely overpowered the flavor of the waffle. If you want to taste strawberries, go buy strawberries.
(b) They are indeed visually and orally identical, except the rectangular Americanized waffles, which are fluffy instead of chewy.
But I must disagree on the final point. There is a specific waffle dealer tourists should seek out: Waffle Planet by the Manneken Pis, the famous Brussels statue of a small boy urinating. Being that the statue is life-size (Read: small) it is not much to see, but it is worth lingering for the waffles. The waffles are only €1; half the price means you can double your waffle intake.