I'll throw my opinion in the ring...
It really depends on what kind of fishing you'll be doing. Since you are looking at a sit-on-top(SOT), I'm assuming you're only fishing flat water like lakes and ponds. If there is a chance you'll be fishing creeks, where you may have to maneuver fast riffles, rapid sections and small waterfalls, in my opinion an SOT would probably not be the right choice. My first fishing yak was a Future Beach 126. It had 2 rod holders, a "dashboard" with strap on tacklebox, a pathetic seat, and one watertight compartment with a covered compartment behind the seat. It was too tight for my long legs and our relationship ended after 2 years. This year I purchased an Old Town Vapor Angler. It's kind of like a hybrid between a SOT and a closed bow yak. the cockpit opening is very long/large allowing ample movement and leg room. However, it still offers the high sides and closed bow to enable me to navigate rougher waters when fishing faster creeks. It also comes with rod holders and an anchor/anchor pulley system.
Me personally, I'd rather 'wet wade' (i.e. nylon pants and old boots) because I love the ability to make my presentation to a target area in the creek from any angle I think would offer me the most advantage. However, I do yak fish from time to time and what I stated above has been my experience. All fishing yaks are just hunks of plastic with rod holders that float. But if you're going to spend 8+ hours in a little plastic coffin, my personal recommendation is to pick one that is comfortable for you and your style of fishing. Your mileage may vary...see you on the water.