What's the difference between these 2?
Is this true that old garlic does get sharper and spicier.
Does old garlic taste bitter sometimes because of the sprout ?
I have used it without an noticeable change of taste, if anything I thing it loses some flavor. It also depends how old it is. a little soft is okay but if it is shriveled or browning I would discard it. Garlic is cheap so why not start with fresh cloves.
Garlic should be aged a bit (before you buy it) to mellow a bit and make it possible to peel, but if it's not still pretty moist, it's lost most of it's flavor- old rubbery cloves have little left. If it's been around long enough to sprout, best to plant it.
Cut garlic will tend to get somewhat rank if not used quickly.