The French place huge emphasis on scrummaging as a macho statement and a chance to win by attrition. Franks said New Zealand's view of set pieces was more pragmatic.
"When you've got backs like the All Blacks have got you need to give them quality ball from set piece," he said. "The better ball we can provide to them from lineout and scrum, the more effective they can be.
"And that's not just with the All Blacks. Every team wants to have that edge and to able to give their backs great ball and it's the physical contest too.
"As men you don't want to be taking backward steps. That's the great challenge of scrummaging and forward play. You win some and you lose some. But big games like this weekend, the team that can perform best in those sort of areas will go a long way toward winning it."
Franks said the All Blacks' scrum had steadily improved this season under the guidance of New Zealand's respected scrum coach Mike Cron.
"I have to say the scrum is where it was always heading," Franks said. "You've got to realise that when we come together as All Blacks, we're a group of guys who've come from different forward packs and it takes time to gel and to get those combinations together."
The semifinal, he added, "was just a progression from when we started way back against Fiji [in June] and it's come right at the right time".
"The difference between a good scrum and a bad scrum can be very small so we need to go up another notch from the weekend because the French pack definitely will, so it will be a great finish." AP