The Difference Between Crimini and Portobello Mushrooms
Even if two
Kelli Foster, writing at The Kitchn , explains how age makes the two mushrooms taste similarly, but useful for very different applications:
Both cremini and portobello mushrooms sport a dark brown color and a smooth cap, and boast a deep savory flavor. Despite their difference in diameter, these mushrooms look and taste pretty similar - and for good reason. The difference between these two brown mushroom is age. Portobello mushrooms are simply the mature version of cremini mushrooms harvested when they're fully grown.
Since portobellos have more time to grow, they have less moisture than criminis and a stronger earthy mushroom flavor. Portobellos also have a meaty texture that lends itself well to certain dishes like a burger topping or sliced in strips. If you're going to cut the mushroom up finely however, like in a pasta sauce, you should opt for criminis since you don't need the meaty portobello texture and you can get more criminis in a package than portobellos.
Image from sweetonveg .