I use my watch mainly for running and hiking and I don’t really need a barometer (I hardly used any of the barometer functions of the Ambit2 on my last trips). That’s why I picked the Ambit3 Sport. It’s a great watch for running and does not feel that bulky as the Peak model. Moreover, pushing the buttons on the Ambit3 is much smoother than on the Ambit2. Also the backlight of the Ambit models look really cool and it really helps to read your data when jogging in the evening.