Skirting the whole "what are you targeting & what technique are you using" issue, here's some very broad specifications based on what I prefer.
1. I use 2 piece rods because they are easier to stow & transport. You're A LOT less likely to break the tip of a 2 piece in a car or house door
. The strength & sensitivity of quality modern 2 piece rods is the same as one piece rods IMO. I've never broken one at the joint. I've broken tips on short striking fish which would happen with a one piece also.
2. I prefer 7' minimum rods as that allows about a 10' radius from the cockpit to swing around the bow (& possibly the stern) of the boat depending on grip & arm extension.
3. I prefer longer handles since you have a longer area to grip while working a fish around the boat or when transfering the rod from one hand to another.
4. I prefer baitcasters to spinning reels, except with light tackle. I never stand in the boat & spinning reels can hang into my lap or bang into my thighs while pedaling, especially if you're cranking the handle at the same time. I can also cast one handed or backhanded with a baitcaster MUCH more easily since I don't have to flip a bail. You're casting angle is much lower to the water in a kayak so you have less time to feather your line - much easier to do with a baitcaster.
All this is just personal preference & opinion. Plenty of guys will feel exactly the opposite for exactly the same reasons