I can't pick one fave mild razor. There are (were) so many great Gillettes. The English aluminium Tech of the late 60s-70s and the black handled Super Speed of that same era hit the sweet spot for me every time.
Medium aggression goes to the Gillette New Improved. Or wait... the Merkur 45 bakelite. No... it's the Fatip Gentile. Ah, it's all three!
The winner for most aggressive for me is the Fatip Grande. A most efficient instrument.