Is a praying mantis stronger than an ant?

It depends, generally, a praying mantis would be stronger, but ants are creatures that live in mass quantity. If you want straight facts, a praying mantis is stronger, if you care more about a real scenario, where there would probably be one praying mantis, and thousands of ants, ants would be stronger. Also to add to this point, ants carry up to 4 times their weight.