I would like the higher resolution of the 535, but I do not like the 160 degree lens, it distorts the image too much. The most important part of having a Dash Cam is being able to get the license plate number. I had a major incident just yesterday where it took me a half hour looking through 400% zoom up frames from my Viva cam the get the number... (Video soon to be posted on youtube, this guy needs to lose his license...)