I have both a SOT and SINK as well, a WS Ride 115 and a WS Pungo 120 (SINK). I like both, the Pungo is a bit easier to paddle because of the shape of the hull but the Ride 115 (SOT) is much more stable for fishing due to the hull design. In a sink, the storage issue is that all of your gear (tackle box, anchor, whatever you feel you need) is inside the yak with you down around your feet, unless you do some "rigging" and install some rod holders, maybe a way to attach a crate to the outside of the hull. Doing all of this rigging will make it more difficult to enter and exit the yak. The SOT has an open cockpit, much easier to enter/exit with a tankwell or storage well behind the seat, you can put a crate there to hold all of your excess gear and its not around your feet. Rod holders can be installed as well along with other accessories if desired. Some people fish out of SINK's some prefer SOT's. I've fished out of both, and depending on circumstances, weather and the style of fishing I doing that trip depends on which one I take. The SOT is easier to fish from imo, but I can adapt to the sink in a matter of minutes as well. You should try and find a dealer that has "paddle days" where you can test drive different styles to see what will work for you. I got the WS yaks because the seats are very comfy for me and my bad back, but that's just me.
GO BIG ORANGE !
I meant to behave, but there were just way too many other options available at the time.