It's not impossible to compare eras, but it is hard, as I stated, for me, because I was in a different mindset back and age group in the 70's than I am now, and I had yet to be exposed to what great Sox pitching was to come, and how fun it is to enjoy watching guys like Clemens, Pedro, Schill (briefly) Beckett and Lester.
I loved watching and listening to the Sox of the 70's, but watching Manny & Papi lead us to multiple rings and break the long cycle of disappointment was magical in a very different way. That's what "makes it hard" for me to compare the two duos. I just can't rank one above the other: it would feel like I am cheapening one of the eras.