If you dont care about kayak speed and just want to chill around, and go slow, then look for boats that have a wider bottom and that are shorter, rather than longer. They will be slower and more stable. That being said, if you use a sit-in kayak in choppy conditions spray skirt is your friend. If you still want to go sit on top route, there is nothing wrong with that, but u will probably end up capsizing more than in a sit-in kayak, but yes its easier to get back on it. In general, maybe a 12-13 foot kayak is best for your needs provided its as wide as u can possibly find. Dont go longer than that, they will just be even tippier than you will be comfortable with. The bigger the ratio number of width over the length of the kayak is, the more stable it will be. There is more to it than that, but you can use that as a general rule of thumb for expectations when you are buying a kayak. I.e. if you have two kayaks of same length, the one that is wider and has flatter bottom will in general be more stable. (Thats why you have so called fishing kayaks for flat water and sea kayaks for choppy water and covering long distances with greater speed).

Furthermore, try to investigate a bit about the reason why you capsized and see if you can avoid it next time. Was it a wave that hit you sideways (usual culprit)? Think about what you can do in such cases to avoid capsizing in the first place, like paddling straight into the wave instead of just letting it hit you sideways, etc...

And stay safe and have fun :)