This isn't just better than Strendu because of the jobs that can use it. It's just plain better.
If MAB adds a percentage to your damage, and intelligence adds damage based on the tier of the nuke, how in the world is 4 MAB going to outdo 4 MAB and extra intelligence?
Edit: I love how people go apeshit for rate downs for no reason. "Oh no. He's typing something true. I can't fathom reading something correct about this game, because I spend my time playing it wrong anyway. /down/down/down"
@Eliosha Outside of Banish/Holy or some Blue Mage spells, the only time you can even possibly say this ring this isn't better than Strendu is when you're up against a mob with high magic evasion, which you would still be wrong.
Until you break the TargetINT + 10 cap, each point of INT gives +1 m.acc, plus pushing your damage closer to the cap. Ideally, you get both rings and your point is moot, but your argument only applies in select situations.