I recently started shaving with a Gillette Slim Adjustable. I was amazed at how mild it feels while still giving a very close shave. Very little blade feel, no weepers or irritation yet something close to a BBS shave. I would call that mild but efficient. That's my subjective experience.
A razor that achieves efficiency (least number of passes required) with blade gap and positive exposure (like Parker Variant Adjustable), while being chattery is an aggressive razor.
A razor which achives efficiency (least number of passes required) with blade gap, positive exposure all the while keeping the blade firmly clasp ergo none to minimum blade chatter is a good balance of aggressive and efficient razor like Game Changer OC 84.
I have very limited experience, but so far I'm inclined to shave with Game Changer OC 84 on daily basis, because I prefer the absence of blade chatter, even though I used to use Variant Adjustable on settings 4, 5, 5 1/2.