I like baby bump because you can do more, you can post pictures on the app instead of going to the website
I use this one and what to expect while youre expecting!
i use baby center but i would not make an account on that app and join the forums. the women there are just, i can't even tell you. sick in my eyes. they live to bully people in a post i saw they even say "we know were mean but we don't care" but baby center is very helpful to use just as an app to follow up on your babys growth and stuff :)
I tried baby center and didn't like it at all. This one is the only one I've been using really.
I use baby center as well just for the extra info it adds to what I learn on this app