Just get one , better yet rent one .
I know this sounds weird coming from a 14 year old but save your money .
Later in life you will think back at my post and say "wow ... I never thought someone on a gaming website could teach me a life lesson ."
Please just choose one , you won't even be playing both and soon one might get old so you throw it out .
Just save your money man , I have my whole life and I have 12,000 dollars in the bank all going to my college .
Just listen to me , thank you .
Get GT5, its more popular, its more fun, there are more options to choose from in terms of... anything at all ever. Also it took me a while to find the one gamestop in my area that had it.
GT5 will provide thousands of hours of unique racing depending on what car, track, type, and PP settings you use for racing. MX vs ATV Alive will provide you about 20 hours before you have done everything there is possibly can do in the game and have to start repeating the same races over and over.
gt5 gt5 gt5 no doubt about it. best car simulation game in history. like the guy up there said, maybe rent the other atv game but im 100000% sure you will prefer to play gt5 and will not play any other vehicle game if you get it. hope this helped lol