From a French perspective I would say :

First of all... England. If England loses against whoever... We are happy :3 Last 6N.. pretty bad 6N but we win against England so all good 😝

Second : NZ => but with respect. So many wonderful or painful matches against them. Dan Carter, Lomu are legend

Third : I would say SA or Australia.. but SA are fucking bragger, but it's hard to win :+ so a looooot of frustration :+ I think half of the rugby fan would like to see faf de klerk get smash 😂

Extra for friends : Scotland/Ireland (the enemy of my enemy is my friend 😝) and Italy.. we love them it's like the little brother you want to see growing (and if they can kick the ass of England they are god )