#Definitely parasitoidism.

Parasitoidism is one of the most widespread ecological tactics in the world. It's a darn good method with a lot of solid theory behind it. It guarantees that your offspring will have an abundance of food when they need it most, and the incredible specialization undergone by parasitoids implies an abundance of niches and an ability to become incredibly efficient. You'll use a minimum of calories to take the thing out (temporary paralysis, only if necessary) and consume a maximum (the entire body of the host).

Also, it's already a thing. Check out this parasitoid wasp taking down a cicada easily 100 times its size:

While the square-cube law is a different problem for scaling this up to megafauna, it's a problem that's been solved before.

Definitely parasitoidism.

Parasitoidism is one of the most widespread ecological tactics in the world. It's a darn good method with a lot of solid theory behind it. It guarantees that your offspring will have an abundance of food when they need it most, and the incredible specialization undergone by parasitoids implies an abundance of niches and an ability to become incredibly efficient. You'll use a minimum of calories to take the thing out (temporary paralysis, only if necessary) and consume a maximum (the entire body of the host).

Also, it's already a thing. Check out this parasitoid wasp taking down a cicada easily 100 times its size:

While the square-cube law is a different problem for scaling this up to megafauna, it's a problem that's been solved before.