Which Sunscreen is Best?

Slate has an article by Douglas Wolk evaluating sunscreens. His conclusion?

As it turned out, every sunblock did its primary job fine. (I asked Dr. Walter G. Larsen, a Portland, Ore., dermatologist and skin-cancer expert, if there were particular sunblocks he recommended. "They're all pretty good these days," he shrugged.)

But effective protection against UVA and UVB is not the only thing people care about when buying sunscreen. They also look at water resistance, smell, greasiness, gloppiness, ease of application, and a host of other considerations. Maximizing utility requires optimizing across many different variables.

And on these criteria, reasonable people may differ; nevertheless, you might be interested in his assessments.