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It's both. Higher pressure due to deflected air under the wing + lowered pressure atop the wing.
Try this, ifn you question Bernoulli: Use a soda straw, and blow along one side of and parallel to a vertically hanging piece of smooth paper. Notice that when air is blown, the paper responds and moves toward the straw.
Now blow at an angle against the paper, and it moves away from the straw, due to pressure on one side but not the other.
Aircraft wing uses both sources of lift, in synergy.
Probably, the greater source is deflected air beneath the wing, but Bernoulli helps, too.
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