The new 15" MacBookPro Antiglare is really nice, but I haven't tried it on location.
I have an older matte 15", and it catches stray light from everywhere when you are outside, even a hood doesn't help much, I always have to watch the histogram to avoid underexposure.
Glossy displays don't have the issue with stray light, but of course act like mirrors, and need a decent hood or such.
They are also very hard to calibrate, yet that for me isn't a major concern with laptop displays really.
That said, I'd choose the new Highres Antiglare (15" only ?), looks to me like the best of both worlds.