Both.
As well-meaning as the people who came up with this rule of thumb and the 320/120 rule may have been, I have to wonder if these two concepts haven't done more harm than good in the long run.
probably closer from 1mab~1.8int these days from testing i was doing on t5's when was release, but remember mab is pure dmg int is dmg/macc.
has for mab vs int in abby if you use atma/ultima with macc on it & you'll prema use MM for 50int/+10 refresh, so u can afford to stack mab over int in gear most the time. (personally i stack mcit gear when possible better returns over time when u close to 20-25% activation rate) & not seen many resists.
outta abby on voidwatch etc u wanna be using int over mab till u not resisting, this depends totally on what u fighting tho.