Gillette HD compared to Gillette #66

[grump]

OK, I was wondering in your opinion, for those of you that have both, How they compare as far as the head, aggressiveness, and the overall shave.

I understand the aesthetics of the rhodium plating, the 66 being heavier, the knurling, but maybe a side by side photo or differences in heads if any.

Thanks in advance
Phil