Yfz 450 or raptor 660?????

ok i was thinking about a 2004 yamaha yfz450 or a 2003 yamaha raptor 660 because there both about the same price used and i ride in trails im never on the track i hill climb alot i was liking the yfz but sence its a race quad i dont know how long it will last because my cousin has one that blew up 2 times in 3 years and he hasnt had any probs with any of his other yamaha"s i was thinking maybe he just ddoent know how to drive it but i know the raptor is dependable because his is older than the yfz but it allso has reverse so im just stumped.....