Its kind of hard to compare a back and a forward. I would say Kaino though because he has to do a lot more tackling and taking the ball up the middle before sending it out wide to the backs (where Tuilagi would be if they were on the same team).

Jerome Kaino is stronger.

Kaino has slightly better raw strength, but overall Tuilagi has the strength to play in the backrow but yet has the speed still to play in any of the backrows. Surely theres an argument for him being one of the games greatest ever athletes if he managed to continue this form for a prolonged period. I'm saying that as neither and England or Leicester fan. He's like a Bastareaud, except has even more muscle, has less fat, and has the speed of most back three players. What an athlete the guy is, and its hard to think but three or four years ago, I would never really be afraid of an England team attacking ball in hand. With this guy there, you just know that he could cut you to pieces. He pretty much beat NZ himself when Eng thrashed them back in 2012.

I would say that overall Kaino is slightly stronger but Tuilagi possesses more explosive strength.