polaris makes a 3 seater but i herd it doesnt handle as well as the rhino. you can get a back seat for the rhino.I got the rhino because we have a 1200 arce camp and its nice to ba able to take the chain saw just in case also what i like about hte rhino is you have 2wd, 4wd, and 4wd full locked diff which means it sends maximum power to all the wheels. i love the rhino because of the durabilty and the features you can get for inside the rhino as well as the outside such as wheels, suspension exhust and much more
CHECK OUT THIS LINK once it loads look to the right and you should see rhino vs polaris and rhino vs artic cat
http://www.yamaha-motor.com/outdoor/products/modelhead2head/318/0/head2head.aspx