4 star doctor strange or hood or Thor

Vampi007

I got all 3 of them and can't decide who is worth upgrading.

Magrailothos

Thor

All have their uses. Hood is great all-round; and very versatile.

Thor is a hard-hitter if he's Awakened; and isn't available (as yet) as a five-star champion. If he's Awakened, I'd definitely go with him unless you had a better option like Corvus, etc. Hood is good without being Awakened, and is a solid option.

Unless he's Awakened, and you're a big fan, I'd ignore Dr Strange. He can be effective, but many better options exist.