I faced this same dilemna this year when trying to decide which way to go. I'm 6'3" 210. I figured this being the first boat Ive owned, I would try the kawi based on the size of the tray, out of the box power and handling and I simply liked the lines of the kawi better.
In the long run, I think I will probably go with a SJ based on my riding skills being much better now and the fact that I will be more familiar with getting mods to get her where I need her.
The SXR is a tank but, as mentioned.......cant beat the ease of ride and the out of the box power. I am very content with the kawi.
I may have been a little biased because I had a 94 SXI for a couple of seasons that was left with me and it ran with no more than oil and gas...........I think there is something to be said for the old old kawis still out there on the water......dependability!