Which ring for a Dragon Knight?

9000 ~ 20000 apple'd with cruel = 54720 ~ 76000 on crits at 5% rate for crit
8950 ~ 19900 apple'd with crit = 51552 ~ 71640 on crits at 10% rate for crit

Crit: [48960 ~ 68000] * 0.9 + [51552 ~ 71640] * 0.1 = 58791.6
Cruel: [48960 ~ 68000] * 0.95 + [54720 ~ 76000] * 0.05 = 58824
Cruel = Crit + 32.4 damage => 2090.32258 more damage for Cruel per minute.

Crit-SE: [55800 ~ 124000] * 0.75 + [91648 ~ 127360] * 0.25 = 94801
Cruel-SE: [55800 ~ 124000] * 0.80 + [95040 ~ 132000] * 0.20 = 94624
Crit = Cruel + 177dmg => 11419.3548 more damage for Crit per minute.

Basically:

So when you choose Cruel Ring, you're gaining a .5% increase on solo damage and losing a 2.2% (due to 1 watk) on party damage.

I guess that makes sense if you're level 200, and all you do is train solo... oh wait