Which ring for a Dragon Knight?

depends on the buff

with everything on (SE, apple, echo, mw 30) my individual non-crit crusher numbers are in the 70ks, with gelt closer to 80k, while the crits are around 130k and 140k respectively without the cruel ring

so that's around 300k+ on average per crusher, and considering i use skis it give it a better/faster chance to pull off crits than if i'd be using a slow spear. cruel ring would REALLY be more of a help for me than crit, since the damage difference is much higher for me than most people

No, I mean is your range 88.2k, because that's what you need to get an extra 30k damage from a cruel ring vs. a crit ring. Obviously, it isn't. Cruel ring does not add any more damage than crit ring besides the 1 Attack buff. It makes your individual crits stronger by a barely noticeable amount, at the cost of losing 5% crit chance.