I've owned both. They each have their place. I just sold my fish/ski and haven't missed it because I was getting no use out of it. It just sat under a shed, mocking me. You know what they say about the first and last days you own a boat being the best. In terms of getting into places where the bass are not pressured, nothing comes close to the kayak.
Kayak Pros:
Light, no trailer and very little maintenance required. Much easier to transport.
No registration required almost everywhere if it's not powered
Cheaper in pretty much every way
Good exercise. I try to get some cardio almost every day. I skip my usual cardio on days that I fish.
Allows access to paces a boat can't be easily launched
Allows you to get closer to fish without spooking them. It will actually surprise you how many big fish can be very shallow that you didn't notice before because you used to spook them out with the big boat and trolling motor.
Kayak Cons:
Not motorized so getting from Pt A to Pt B takes time and energy
Limited storage space. Not easy to carry a lot of gear and be prepared for every eventuality. I have a rigged crate and can carry 7 rods and some extra tackle.
You can't paddle and cast and reel at the same time. You can get peddle kayaks or rig a trolling motor, but those still require a hand to steer and they start to negate the cost savings over a big boat.
It's more primitive as electronics don't come with it. You need to rig your own. Electronics are necessary if you're going to fish deep structure, so you're a little confined to shallower lakes/ponds. Electronics push that cost back up. I mostly fish private, shallower places, so that's fine. I do have a fish finder on one of my kayaks, but mostly use it as a water temp gauge. LOL.
The older I get, the more I start to see that a big boat is more comfy to fish from. After 5 hours in a kayak, I'm tired and I feel it a little the next day. I think the Ghenoe with a gas and rolling motor looks like a good compromise. But I'd still keep the kayaks.
I want this! Take my money now! The wife and I plan to retire to somewhere coastal and this would be about exactly what I'd want. I have little desire to go offshore and if I do, I can pay someone to put me on fish way cheaper than I can do it myself. Being a bass fisherman, I like inshore much better.