I've had my Defender for just over a year and like it. Bought it used from a guy . Hopefully this year I'll get a deer to put in it.
I have taken our Polaris XP1000 Ranger through some nasty stuff in Wyoming and Montana. It has just over 6,000 miles on it and I wouldn't hesitate to take it anywhere. On a side note, relatively speaking, it is pretty fuel efficient.
I am also looking at the Polaris XP1000 this year waiting for them to go on sale. it seems to be the best bang for the buck down here.
My Yamaha Viking has been reliable. I only use it to hunt and work around the property but no complaints about it