Apart from flexibility, you can also self-host wordpress. So this is an important parameter to think about if you believe that this might be something you want to do down the line.
If you are only concerned about ranking, do a simple google search (incognito mode) for the keywords that you are targeting. If you have a lot of blogger sites showing up in the results, then there may be some benefit from going with blogger. In my personal experience, entertainment category keywords tend to have more blogger results than other category keywords.