I'm in the market for some rear toe control links/tie rod since mine are worn out. I noticed that there are two types, a pillow ball and a rubber bushing version. Which one do you prefer and why?

Pillow Ball:



Rubber Bushing:

 

pillowball:
good = no play
bad = usually not of good quality, will develop play quickly, subject to binding/seizing due to elements, no play (harsher), disqualification from certain racing classes, will be noisier than bushings (i hear solid clunks from my rear with heim jointed rucas)
fix = you can replace the ends with quality joints from places like
http://www.bakerprecision.com/
http://www.aurorabearing.com/
they will last longer and withstand elements better, but they'll still be noisy and solid

bushing
good: will most likely have longer life than cheap heims, more compliance for more streetability (although my guess is you won't even notice the difference), quiet, racing class rules may require bushing ends
bad: more compliance means more play in suspension (once again i doubt most people would notice, including myself)

btw, you can almost always remove the bushing ends and install heims from the websites above, making the difference between the arms negligible. therefore, if you plan on going quality heims, just get the cheaper one and then buy the heims from baker or aurora