Basic sword 21 dmg with perk 42, dual dword power attack 126 dmg (21x2x2x1,5) a second
Destro as used in the math ( not bothered to checked if done correct by the OP ) 112.5 dmg a second with 59 mana
We skip the realistic values of health:stamina of meele and magica of mage and go with the bogust 500 stamina and 500 mana values. Both damage values are per second so we add the total values of a full bar.
500 stamina gives us 10 dual power attacks that gives us 126dmg x 10 = 1260 dmg per stamina bar
500 mana gives us 9 seconds of spell attack that gives 112.5 dmg x 9 = 1012,5 dmg per mana bar
Conclusion: 1260 meele dmg >> 1012,5 destro dmg
normal attacks take 1 second to swing one sword so we`re doing a constant 42 dmg per second.
spell dmg does 112.5 dmg per second but only for 9 seconds.
Conclusion: 42 meele DPS <<< 112.5 destro DPS
There is the penalty of mana running out after 9 seconds but we are fighting one oponent and we are gonna kill him anyway if hes 1k health,
This dosnt take into account the value of disintegrate that kills an enemy that has less than 20% health. ( if enemy has 1k hp then he dies instantly if he falls below 200 hp, bonus of 200hp less dmg to deal per enemy )
Doesnt take into value racial bonus of 50, with it the mana bar dmg would be 1125 dmg per mana bar.
This conclusion dosnt take into account +magica gear (to be fair, really


Edit. Corrected the one handed dmg value

You can throw a dual-cast incinerate every second.

See this is what I'm talking about where people are posting threads about destruction damage when they just simply don't know what the hell they are talking about. I know you didn't come up with that number, but I remember the thread it was posted in and theres no other way to say this nicely, that OP was completely full of [censored] clueless about what the [censored] he was talking about. He was literally just making [censored] up. People doing mathematical dps comparisons based on an arbitrary amount of mana in your pool and stuff like that. That whole thread should be disregarded as trash.