I have driven Hondas for years now. Before Honda I had Toyotas. Both are excellent cars. I really don't know much about Nissan to give you much information. However, I do suggest this after working at a car lot. Do you have a honest mechanic that could check the car out before you purchase it? As much as I hate to say this, sometimes the car lots are not completely honest.
Good luck in your search. I never did enjoy looking for a car.