I got a charge 2 for Christmas. It has a stopwatch, a heart rate monitor, alarm, notifications on it. It also has a watch band on it to where you can switch bands if you want to. It also tracks your sleep and steps and how many stairs you climbed. It also reminds you when to get up and exercise. I love it. I like so much better than my first charge that I had.
Hope this helps you decide which one you want to get! Good luck in your exercise endeavors.

Wait before you buy anything. They are about to come out with the new Fitbit Versa. I think it gets released in April.

I've had the ionic since late January. Actually I've had 2. The first 1 worked fine until after 2 weeks, the screen wouldn't come back on, even though it still had about 50% left on the battery. Once I plugged it in, it was fine, then happened a week later and never turned on again. I have another one and it seems to be working fine, but after browsing the community on the Fitbit site, lots of people had the same issue. Otherwise, I really love the ionic, but I'm hoping it doesn't happen again. My husband bought one too and hasn't had any problems (fingers crossed!).

Love my Fitbit flex 2. I have many different color bands and several jewelry accessories makes it fun to wear. The dashboard on my phone covers what I need to know - weight tracking - water intake and with it sinking to my fitness pal calories and sleep tracking.