lots of options, i prefer a SOT for fishing b/c i am in and out of the boat a lot for wading etc. I can also turn side saddle without flipping, and they allow more freedom of movement.
Think about what you need, up top storage, dry storage, speed, weight, length, transporting, capacity...all factors you really need to decide up front and then go from there.
lastly, save the money on all that "fishing extras" that some suppliers offer. Get the yak and fish out of it a few times. get a feel for it, and how YOU want to set it up for the fishing YOU will be doing.