I have tried about four Tat Blacks from the ceramic jar release and have yet to find one with any taste appealing to my palate - very disappointing IMHO. I'm hoping some additional sitting time will fix that. I have never tried a Black from the first release nor have I tried a Tat Black Robusto.
I have tried only one Frank immediately on the day I received it in the mail and was very impressed with the balance, complexity, and richness of flavors - a quality smoke indeed. I need to try another one soon to see if I feel the same about it just in case it decides to go through a "sick" period.
So from my limited experience with these , the Frank is a superior smoke in addition to it being rarer i.e. lower production.
I have seen some people trading Franks 1:1 for Blacks and frankly (pun intended) I wouldn't agree to that trade ratio - I think a Frank is worth more than one Black in trade value.