Ultraevolve Help

Whom should I ultraevolve?
Omegawarym
Necrowing
Rexobone

Rexobone, he gets time strike, easy way to get the first kill and start a sweep with this beast

Omegawyrm will only get knock back so I’d evolve him last out of the 3

Necrowing will get stun immune if I’m not mistaking, thats always good to have, but I’d still go with Rexo