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!