OK. Here's the roundup so far.
A few takeaways:
Pretty much all of them say 80 minutes is the limit for performance in the presence of water (or sweat). Endurance Shield suggests it can do more --
and some of the testimonials do as well -- but I'm guessing you're pretty much on your own after an hour and a half. The ones marketed as high-performance tend to have a price tag to match.
Z Blok and Sun Bum both offer zinc oxide-based versions which seem to have a selling point of not causing your eyes to tear up. The rest seem to be petroleum-based formulas.
Most major brands seem to offer a range of SPF but Sun Bum's 70 was the top number I could find in this quick survey.
A lot of these also come in lotion and spray versions. There doesn't seem to be any information if one or the other affects durability.
Fragrance free isn't always listed but neither do most of these tout a specific scent.
For me, personally, I'm thinking one of the lower priced ones will probably do for my regular runs but I'll need more input/research for deciding what will be best for longer runs.
One tidbit I came across pulling this together which I had forgotten, sunblock is only good for a couple of years at most. Many brands have an expiration date on their bottles. So you might want to check for that as we start to slide into the summer months.