I agree with mrsmom.... Typhoon Lagoon has much more shading.
Just wanted to chime in againWe went to Blizzard Beach on Fri. & there were Plenty of areas with shade, (we didn't get there til aprox 3 pm and there were still lots of chairs/lounges left in the shade as well). Have a Fun time! Both parks are Great! I Loved the theming at BB!!!
Lots of people leave around 2 or 3 PM because of the afternoon rain storms. I wouldn't expect to find a shady spot at either water park within an hour of the park opening in the summer. They get taken early. Around 3, you might find one that someone else left.
...For my own sake (we have FL resident after 2 water park passes)....I really hope that it's not just the afternoon storms that people leave the park early for....I was thinking that by 2 pm people were just tired & ready to leave the park by then. I'm sure it's a mix of the two or at least I hope so!....