In a perfect world ($$$ not an option), a sit on top is better suited for fishing for the reasons stated above. Not sure of what your budget is, but you really can't go wrong with either.
To get into the sport without spending a lot, a sit in kayak will suit you just fine. I picked up my sit in about 2 years ago while unemployed and unable to find work. It's a 10ft Pelican that I've modified a little to make it easier for me on the water. I've added rod and oar holders, fish finder, storage crate, GoPro camera, and a few other things. I've landed countless bass easily, as well as big Pike with no issues. Like I said, in a perfect world I'd have a pimped out Hobie sit on top fishing kayak, but I just don't have $1500+ burning a hole in my pocket
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Dick's Sporting Goods carries a nice 12ft sit on top fishing kayak for less than $500. Has decent dry storage, rod mounts, and scupper holes in case of a surf launch/landing. My buddy has one and loves it. Doesn't mean he catches more fish than me when we go out though lol.
