I think the main reason is because Yamaha's are more popular than the Suzuki's due to more extensive marketing. I don't like to answer questions on here unless I have first hand experience with the ATV's (or close friends experiences). I would never even thought of the King except I was out riding one day and talked to a guy that had one. The last straw with my last ATV (Yamaha 450) was when I opened my shed and all the front diff fluid was on the floor (this after replacing all my wheel bearings between 2100 and 2400 miles). That's when I went to the King. Don't get me wrong it had issues too (rear a-arm bushings) but they are much easier than the wheel bearings. All this in 3400 miles now.
Just remember though the dealer is as important as the machine. Make sure you get a dealer that will help you if an issue comes up. Lord knows most of the manufacturers won't.
Buck