Lots of opinions here.
If you want to go fast in a straight line then a surfski is great.
If you want to go on an seakayak tour then things link ND Explorers Cetus, Scorpios and other large expedition boats are great but will cope with cave and rock hoping but need better technique to turn.
Boats like the Romany surf /sport work well in lots of conditions and can do everything quite well.
Boats like the Delphin are good in surf and tideraces but are slower than the above but turn very well and can cope with a short expedition.
Crossover boats like the Stratos and P&H Virgo are good at rockhopping and lightish and very agile but they don’t paddle well in a straight line without using the skeg (also Delphins are like this).
Before you buy a boat try and paddle it and get a feel for it some boats you will get on with better than others.
Please get some training as it will help you progress quicker and help keep you safe.