I have two machines -- a Polaris 500 HO and a Yamaha Grizzly 600.
The Grizzly is a brute. Powerful, noisy, and hard on the body at speed. The Polaris is much smoother. It doesn't accelerate quite as quickly as the Grizzily, but it's considerably faster at the top end, handles much better, and is much easier on the body. I like the lights on the Grizzly better.
The Grizzly is my work machine, and I got the Polaris for my wife. She hasn't ridden it in about a year, so I'm going to get rid of one.
It breaks my heart, but I'm going to have to get rid of the Polaris, because I need a work machine to move dirt, tow a small disk harrow, and haul stuff. That's what the Grizzly does best. If all I wanted a riding machine, it would be the other way around.