It may not offer all features of Firebase, but once you spend some time learning Parse and setting it up - which may not be always so easy and polished like Firebase, you will own it.
And that is the biggest plus. I have been through 5 major companies killing 5 major dependencies of my little app over the past 10 years, that was like one major migration every two years.
So if you are serious about your idea, do not go with Firebase, if you want to just get something quickly up and running, then yes, Firebase may be quicker and more polished in the beginning, but becoming a time bomb in the long run.
Just my .2 cents,
Martin