what mantis species is the strongest?

[TheShad0w]

I have to add onto agent A's observations there, I got an oxy nymph at the moment that is no bigger than the end of a q-tip and it stalked, caught, restrained and ate a roach almost 5 times its size.

Which Oxyopsis subspecies? As I think there are about 11 in that family

 

[happy1892]

Pnigomantis medioconstricta are rather strong and aggressive. They are good at grappling prey.

Edit:
They seems to be stronger than H. membranacaea, and maybe stronger than H. majuscula. P. medioconstricta is definitely quicker with grappling than all the other large mantis species I have had. So I would expect an adult female Double Shield mantis to win against most species of mantis similar in size in a fight.