Yes, I have done both and prefer a kayak, as they way you sit in them, makes them more stable and easier to paddle.
This is my Commander 120 we use for river fishing and hunting Flat Water
Now, I don't really recommend hunting alone, in a kayak much. Where are you hunting? Pond? easy place to get out if you get wet?
When hunting out of one get a lifevest made for summer with mesh on the shoulder. make sure you can wear it under your coat and shoulder a gun with it on and NEVER take it off while out. The kayakers rule is if the air and water temps do not equal 120 when added (air + water) you need to have waders and a life vest on at all times! The life vest acts like a wader belt and helps keep you from being under long and keeps water out mostly.
I am also going to probably buy a Ride 135 and make a blind for it next year so the dog can tag along and the water she brings in will drain right out.
Here is how I made a blind for my Commander 120 that we use like layout boats.http://archeryrob.wordpress.com/2013/03/20/waterfowl-blind-for-a-commander-kayak/
I love hunting and fishing in my kayak, but I take extra precautions and don't normally do it alone!
"If you can't have fun doing it, it ain't worth doing, or you're just doing it wrong."
River hunting in my Wilderness Systems Kayaks; Commander 120 and Ride 135
My Blog archeryrob.wordpress.com Confessions of a fisherman, hunter and tinkerer