Really depends on tier and gearing and such. Ie the higher the base dmg the less potent magic dmg stat will be because of diminishing gains. But let's arguments sake let's say we are rocking a 50dint and say +200 MAB without staff which round numbers aside is fairly decent set right now. Using these amounts NQ atinian will win on any spell below fire V in pure dmg. Specfically with no mdb/mdt day/weather or resist to deal with on Aero V magian staff will deal 4090 and atinian will deal 4091. Admittedly not much a difference but lets look at say stone I. With magian dmg would be 445 with atinian 1030 <.<.
To look at it another way yes while a straight +35% dmg on the top is alot +195 magic dmg is also alot. Look at all the single target spells. Even at 50 dint which is a decent amount given how much MAB gearing is going on now and how high int mobs have you don't even break 1k base dmg till aero V and well 195 magic dmg and 12 more int is basically like 20% more dmg by itself before you even consider the effects of MAB.
To sum up if rdm got atinian there is pretty much no case outside of brewing where rdm would actually do more dmg with magian in nuke per nuke. And as far as dmg vs time or mp costs using atinian and lower tiers will be number one for every job. After all why spend 200 mp on a spell to deal 4k dmg and spend enough time casting it to be interrupted when you can cast 4 4mp spells for 1k each at what is now basically chainspell speed. And this is just the NQ. HQ is a bit stronger.
Basically magian dmg staffs are for jas now if you really want to spend alot of extra time making them for a spell that is rarely useful for like another 1% dmg. Or to cast a little faster. Macc staffs are pretty much out. Even for stunning its probably easier just to haste/fast cast gear up to compensate for the -recast. I suppose hardcore brds might use some -recast/cast time ones for buffs
