Well dude, There are differant makes and models. Jackson(my best) dagger, wave sport, prijon etc... and models playboat,(playrunners) river runner, creeker.
I have found that a playboat/riverrunner like my superfun lets me have fun in a controlled enviornment but I get my ass kicked in technical pushy water. When I boat my super hero I am confident less play like and more down to business in bigger stuff while I am learning the lines. And the creeker, I am not your guy for this catagory but they move fast and point on a dime, solid boat if you can control them.
Now, all makes have differant outfitting and sizes of model. so the only way to know what boat is for you is to sit in as many makes as possible and try outfitting it for you.
you want to have room to relax on the flat but get tight on the rapids. so a snug dry fit is best. I find as you get more comfortable in your boat you will be forever tightening your outfitting(what was once snug is now loose) so dont buy a lake boat.
I like to rep jackson they have the simplest outfitting foot bag aside and I like there stuff. Others like pyranha and ws. I did too but jackson has the room and volume I need. I am a big guy, little guys will differ on boats,
Welcome to the buzz, prepair to be throttled, And good luck. I own sevral boats, all differant and all fun.