Well, this question is not very fair considering that Marvel has released 16 movies to DC's 4.
Now, if the question had been, "Which first 4 films are better? DC's or Marvel's?" Then you've got something.
And for that question, I'd say Marvel.
Because with DC:
Man of Steel was meh.
Dawn of Justice sucked.
Suicide Squad was decent.
Wonder Woman, so far, is my movie of the year.
With Marvel,
Iron Man 1 was amazing.
The Incredible Hulk was mediocre
Iron Man 2 was OK.
Thor was great.
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