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Cornelia's Ring provides a hefty boost to your strongest physical/magic weaponskills all of the time, under all circumstances. Even when you're attack capped, Cornelia's Ring provides a big damage boost. I get it, it's boring and people desperately want something else to be better, but that doesn't change the fact that it'll still likely provide the biggest boost.

Ephramad's Ring has the potential to situationally spike to slightly higher damage values (seriously, run the sims yourself and make sure to account for the existence of other PDL+ gear options, the difference between the rings isn't as high as some here are making it out to be) for physical weaponskills than Cornelia's Ring, but falls well behind when the conditions of those situations are not met. The reality is that with the widespread (and ever widening) availability of Aria of Passion, Prime weapons, augmented Odyssey gear, some Sortie earrings, some JSE necks, Crepuscular Pebble, Sroda Ring, and now Limbus gear, the set of situations in which Ephramad's Ring is superior has become practically a niche. This is especially true for Aria of Passion; that buff really took the wind out of Ephramad's sails.

We're all aware of this fact, but I think it deserves extra attention- by going with Ephramad's Ring, you're sacrificing 10% WSD due to opportunity costs of not having Cornelia's Ring. While the 10% PDL+ is nice when you're attack capped, remember that you're lowering your WSD by 10% to gain that (WSD+ is still just as valuable even when you're attack capped), and the only gains you'll see are the difference between the two potential boosts, that difference generally being pretty small. And no, the attack+ and stat+ on Ephramad's Ring does not help close the gap as much as some are implying.

Someone in the other thread made the claim that "WSD+ has diminishing returns, but PDL+ doesn't." I've heard this before from others, so I want to make sure we're all tracking correctly. Neither stat has traditional "diminishing returns". WSD+ has linear returns from start to finish. PDL+, on the other hand, does have conditional quasi-diminishing returns, in that the returns disappear completely once you have "enough". PDL+ is similar to accuracy in that if you don't have enough, adding more can make a big difference, but if you do have enough, adding any more is completely pointless. There is no such thing as "enough" when it comes to WSD+, making Cornelia's Ring always valuable.

The mention of PDL+ affecting white damage and/or the accuracy boost from Ephramad's Ring in your TP set is really not worth any consideration. The damage boost you'll get from using Ephramad's Ring in your TP set is microscopic, and there are much better ways to boost your accuracy in a TP set than completely sacrificing your ring slot. Criticizing Cornelia's Ring because it's only good in a WS set is ridiculous, Ephramad's is also only good for WS sets (ok, ok, maybe also physical BLU spells, lol).