Great Western Trail 2nd edition, Argentina or New Zealand?

I keep stumbling across this game. It sounds like it would fit in really well with us. We haven't played any of them yet. What's your favorite and why? We're leaning a bit toward New Zealand because my wife is a New Zealand fan and we like the artwork. According to BGG it's also slightly ahead. We don't have a problem with complex games, it should also work well for two and not go into direct confrontation, my wife usually doesn't like that so much. Looking forward to your opinions.