Which champ is better?

Chickenneth

Four stars.

PantherusNZ

"Better" is very subjective and it really does depend on what content you're trying to complete.

The fact that you're asking about 4* though suggests that, at your level, Blade is going to be of more use - once he's awakened he'll be even better.

Stealth Suit Spiderman is an amazing champion but his key abilities are a but more niche and tricky to keep up.