I have a Kokatat Rogue and a Sweet Shadrach (which is the "playboating" version of the Prophecy). I'm 5'10" 165 pounds with washboard abs and shoulders like Atlas. I have an XL Rogue and a L Shadrach (the XL was gigantic). The Rogue is more comfortable and I wear it for longer, creekboating trips. However, the Shadrach is drier, especially in the wrist areas. The Sweet top seems to also still shed the water better than the Kokatat. The material for the Kokatat tops seems to lose its ability to bead water after a season of use.
I've worn Kokatat Gore-Tex drytops for about 20 years (my first one was the purple and yellow version) and have been extremely happy with them. Except for this last year when my Gore-Tex Meridian drysuit leaked A LOT in the left shoulder. Kokatat wouldn't honor the warranty, even though I had only worn the suit three times. I was told that I had punctured a hole in the shoulder, probably from carrying my boat. I never carry my boat on my left shoulder though. Anyway, 4 Corners eventually replaced the drysuit (thanks guys!).
I'm sure this thread will now be bombarded with testimonials from people who have had wonderful experiences with Kokatat's warranty, but I'm just letting you know about that one time that I spent about a thousand dollars for soaking wet shoulders and arms.
So, I think it depends what you are going to be using the drytop for, how frequently you boat, and the kind of abuse you are going to put it through.
Sorry, Mister Ed.