Why would anyone ever choose an adept over a mystic adept when the cost, from what I can tell, is exactly the same for the same # of PP?
Out of chargen a physical adept will potentially have the exact same amount of power points as a mystic adept that focus 100% on the adept side rather than the mystic side.
The only advantage a physical adept have over a mystic adept that is 100% focusing on the adept side rather than the mystic side is that post chargen a physical adept get a free power point each time they increase their magic (as well as when they pick power point during initiation) while mystic adept don't (and can only ever gain power points via initiation).
As written this also mean that a physical adept is also
much better suited to get augmentations than a mystic adept.
So the choice between a physical adept and a mystic adept basically boils down to be between "easier to get extra power points + easier to get augmentations" and "access to spells/summons". It seems pretty balanced to me.
Out of chargen a full magician will potentially have the exact same amount of spells and rituals as a mystic adept that focus 100% on the mystic side rather than the adept side. The only difference is that a full magician get astral perception for free (something a mystic adept can get by spending 1 power point, which during chargen is the equivalent of 2 spells or rituals) and also have the ability to use astral projection (something that a mystic adept can never get).
Post chargen the full magician does not have any advantages over the mystic adept except that a full magician still get astral perception for free (something a mystic adept can get by spending an initiation, which post chargen is worth one metamagic) and also have the ability to use astral projection (something that a mystic adept can never get).
So the choice between a full magician and a mystic adept basically boils down to be between "free astral perception and access to astral projection" and "access to power points". Depending on how creative you are allowed to be with astral projection this might or might not be balanced.
Out of chargen an aspected magician that only focus on sorcery will have 2 additional spells or rituals and +1 magic rating compared to a full magician that only focus on sorcery. If both of them aim for magic 6 the +1 magic point is basically worth the same as +1 adjustment point.
Post chargen an aspected sorcerer don't have any advantages over a full magician that only focus on sorcery except the fixed two free spells and rituals and original +1 magic rating/adjustment point. This is worth perhaps 20-55 karma depending on your metatype and where you placed the extra adjustment point. While the full magician always have the option to give up sorcery karma for summoning and enchanting.
So the choose between an aspected sorcerer and a full magician basically boils down to "20-55 karma advantage out of chargen" and "access to conjuring and enchanting". Short term I could see some use for an aspected sorcerer, but it will depend heavy on just how useful spirits are in this edition.
Out of chargen an aspected conjurer or enchanter only get +1 magic rating/adjustment point (which is worth 10-45 karma depending on your metatype and where you place the point, no matter what Magic or Resonance priority you pick - you should probably never pick more than D in this case) while a full magician that only focus on conjuring or enchanting still get 2 spells or rituals per Magic or Resonance priority (which is worth 10 karma per priority, if the magician ever decide to invest into Sorcery).
Since aspected conjurer or enchanter only gain +1 adjustment point per rank of Magic or Resonance priority (which is less than the +3 to +5 adjustment points per rank of Metatype priority) aspected magicians doesn't really benefit at all and a Full magician would probably almost always the better option here...