Sorcery keystones are the worst, brah.
Out of the 3 major keystones, 2 are almost identical, and the last one only like 3 mages can even use it or benefit from it.
Then looking to the minor keystones, we have 3 movement speed runes out of 9, one in each tier (if include major keystones, there are 4 MS runes out of 12, the ratio is the same). Not sure what even is Riot's definition of "Sorcerer" because last time I checked, Sonic isn't called an archmage. And mages don't use the MS runes outside of Celerity surprise surprise, and only because the other 2 runes next to Celerity are utter dog shit which I will get to below.
Now, onto the Celerity row, we have Transcendence that is very niche and kick in way too late to really resemble any usefulness. And we also have Absolute Focus, which is utter garbo rune no one would ever use. And both of which is clearly outclassed by Celerity, and so you're forced to pick it in that row.
So what Sorcery tree is left with, is 2 choices between Manaflow Band and Nullifying Orb, or between Scorch and Gathering Storm. In fact the Scorch vs Gathering Storm isn't a choice either, because if you're DoT champ or early game mage, for instance, you'd be using the Scorch, and the more late-game oriented will use the Gathering Storm. There is no choice to be had there.
"What about Nullifying Orb vs Manaflow Band?" You might ask, seeing I'd skipped it so far. You might wonder that well, between Nullifying Orb and Manaflow Band, it seems that there's a great conflict to be had there. Well jokes on you, because Riot thought to use Manaflow Band as the balance crutch for all mages and so we end up with the situation that mages have to use Manaflow Band while other NOT mage classes are often far more resource efficient than mages who are supposed to be most attuned to spells, and what's more, they normally would have their own runes and won't touch the shitty Sorcery runes with a 10 foot pole. So what we're really left with is just mages would almost always run Manaflow Band, and sometimes alternative-resource mages or mage assassins may use Nullifying Orb, because they are not constantly in thirst for mana unlike traditional mages, as ironic as it sounds for the latter of the 2.
So all in all, what are the real and tangible choices to actually have Sorcery Runes, well....... You get to choose if your flying projectile that hit an enemy after a spell is lock on or an AoE, ie Aery vs Comet.
YAAAAAAAAAAAYYYYYYYYYYYYyyyyyyyyyyyyyyyyyyyyyyy................................