It's an old discussion, and people usually assume that others have already read it ten times.
200 slayer is better for sk no matter what you kill until 217 slayer, assuming you keep all regular buffs and Sotos running at all times. If you're a lazy ass gimp and don't use Sotos, the 213 slayer might be better. In my experience the 200 slayer is equal to 217 one too, but after 100 levels and 17 shadowlevels with the green/turning greyish bot I would rather use the 217 one anyway.
On rk, and for any situation where dmg is not your main concern, the sl slayers are better then the 200 one.
Best bot for sk'ing is the chicken!