The OP is Phenolic, not plastic. Their plates are sturdy. I've have my OP table going several yrs now. No issues at all.
IMHO, the OP doesn't need those "T" tracks. It does have a miter gauge, which is a very handy accessory. I wouldn't or ever will get rid of my OP. It does everything that those that have all the bells an whistles do. Because it follows one concept. K.I.S.S. rule.
I can't answer for the Bench Dog, I don't have one.
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"Whether active duty, retired, national guard or reserve - is someone who, at one point in their life, wrote a blank check made payable to "The United States of America", for an amount of "up to and including my life". That is HONOR, and there are way too many people in this country who no longer understand it." -Author Unknown